I have compiled a list of groups on lawyrs.net including signup links for those who have not joined the lawyrs network yet. I have tried to list groups, which I think could be interesting to other LLM-Guide users. If you find more interesting groups, please post them below.
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LLM Groups:

- General -

LLM-Guide Group (66 members)
http://www.lawyrs.net/groups/6/llm-guide
Signup link: http://www.lawyrs.net/llmguide/6


- USA -

NYU LLM 2009 (63 members)
www.lawyrs.net/groups/33/nyu-ll.m.-2009
Signup link: www.lawyrs.net/llmguide/33

Columbia LLM 2009 (32 members)
www.lawyrs.net/groups/30/columbia-llm-class-09
Signup link: www.lawyrs.net/llmguide/30

Harvard LLM 2009 (25 members)
www.lawyrs.net/groups/29/harvard-llm-class-of-2009
Signup link: www.lawyrs.net/llmguide/29

Duke LLM 2009 (24 members)
www.lawyrs.net/groups/31/duke-2009-llm
Signup link: www.lawyrs.net/llmguide/31

Georgetown LLM Class of 2009 (47 members)
www.lawyrs.net/groups/25/georgetown-llm-class-of-2
Signup link: www.lawyrs.net/llmguide/25

Northwestern LLM 2009 (21 members)
www.lawyrs.net/groups/55/northwestern-university-l
Signup link: www.lawyrs.net/llmguide/55

Fordham LLM 2009 (17 members)
www.lawyrs.net/groups/38/fordham-llm-20082009
Signup link: www.lawyrs.net/llmguide/38

UCLA LLM 2009 (14 members)
www.lawyrs.net/groups/27/ucla-llm-class-of-2009
Signup link: www.lawyrs.net/llmguide/27

Boalt Hall LLM 2009 (10 members)
www.lawyrs.net/groups/59/boalt-hall-llm-class-of-2
Signup link: www.lawyrs.net/llmguide/59

Boston University LLM 2009 (9 members)
www.lawyrs.net/groups/40/boston-university-llm-200
Signup link: www.lawyrs.net/llmguide/40

USC LLM 2009 (7 members)
www.lawyrs.net/groups/39/usc-llm-20082009
Signup link: www.lawyrs.net/llmguide/39

UPenn (5 members)
www.lawyrs.net/groups/67/upenn-llm-class-09
Signup link: www.lawyrs.net/llmguide/67

Cornell (2 members)
www.lawyrs.net/groups/47/cornell
Signup link: www.lawyrs.net/llmguide/47


- UK -

Cambridge LLM 2009 (29 members)
http://www.lawyrs.net/groups/68/cambridge-llm-class-of-2009
Signup link: http://www.lawyrs.net/llmguide/68

Oxford Class of 2009 (18 members)
http://www.lawyrs.net/groups/28/oxford-class-of-2009
Signup link: http://www.lawyrs.net/llmguide/28

UCL LLM 2009 (55 members)
http://www.lawyrs.net/groups/34/ucl-llm-class-of-2009
Signup link: http://www.lawyrs.net/llmguide/34

LSE LLM 2009 (23 members)
http://www.lawyrs.net/groups/32/lse-llm-class-of-2009
Signup link: http://www.lawyrs.net/llmguide/32

Queen Mary LLM 2009 (23 members)
http://www.lawyrs.net/groups/57/queen-mary-llm-20082009
Signup link: http://www.lawyrs.net/llmguide/57

Kings College LLM 2009 (27 members)
http://www.lawyrs.net/groups/43/kings-college-london-llm-20082009
Signup link: http://www.lawyrs.net/llmguide/43

Edinburgh LLM 2009 (3 members)
http://www.lawyrs.net/groups/58/edinburgh-llm-20082009
Signup link: http://www.lawyrs.net/llmguide/58


- Europe -

Leiden LLM 2009 (29 members)
http://www.lawyrs.net/groups/36/leiden-llm-20082009
Signup link: http://www.lawyrs.net/llmguide/36

Amsterdam LLM 2009 (14 members)
http://www.lawyrs.net/groups/41/university-of-amsterdam-llm-20082009
Signup link: http://www.lawyrs.net/llmguide/41

ILF LLM 2009 (16 members)
http://www.lawyrs.net/groups/37/ilf-llm-20082009
Signup link: http://www.lawyrs.net/llm-guide/37

EMLE Group (16 members)
http://www.lawyrs.net/groups/64/e.m.l.e.
Signup link: http://www.lawyrs.net/llm-guide/64

Maastricht LLM 2009 (1 member)
http://www.lawyrs.net/groups/73/maastricht-university-llm-20082009
Signup link: http://www.lawyrs.net/llmguide/73


- Asia -

NYU@NUS Class of 2009 (29 members)
http://www.lawyrs.net/groups/35/nyunus-class-of-2009
Signup link: http://www.lawyrs.net/llmguide/35

NUS LLM 2009 (25 members)
http://www.lawyrs.net/groups/42/nus-llm-2009
Signup link: http://www.lawyrs.net/llmguide/42

International Business Law @ NUS Class of 2009 in Singapore and Shanghai (6 members)
http://www.lawyrs.net/groups/70/international-business-law-nus-class-of-2009-in-singapore-and-shanghai
Signup link: http://www.lawyrs.net/llmguide/70


- Australia -

Melbourne LLM ( 2 members)
http://www.lawyrs.net/groups/44/melbourne-law-school
Signup link: http://www.lawyrs.net/llmguide/44


Other interesting groups:

Law Firm Networking
www.lawyrs.net/groups/66/law-firm-networking
Signup link: www.lawyrs.net/llmguide/66

In-House Lawyers
www.lawyrs.net/groups/54/in-house
Signup link: www.lawyrs.net/llmguide/54

Tax Consultants
www.lawyrs.net/groups/19/tax-consultants
Signup link: www.lawyrs.net/llmguide/19

Criminal Lawyers
www.lawyrs.net/groups/15/criminal-lawyers
Signup link: www.lawyrs.net/llmguide/15

Intellectual Property Law Group
www.lawyrs.net/groups/21/intellectual-property
Signup link: www.lawyrs.net/llmguide/21

Human Rights
www.lawyrs.net/groups/14/human-rights
Signup link: www.lawyrs.net/llmguide/14

WTO Law
www.lawyrs.net/groups/49/wto-law
Signup link: www.lawyrs.net/llmguide/49

WTO and Environment
www.lawyrs.net/groups/50/wto-and-environment
Signup link: www.lawyrs.net/llmguide/50

Lawyerscommunity in China
www.lawyrs.net/groups/51/lawyers-community-in-chin
Signup link: www.lawyrs.net/llmguide/51

American Lawyers
www.lawyrs.net/groups/17/american-lawyers
Signup link: www.lawyrs.net/llmguide/17

French Lawyers
www.lawyrs.net/groups/22/french-lawyers
Signup link: www.lawyrs.net/llmguide/22

Italian Lawyers
www.lawyrs.net/groups/8/italian-lawyers
Signup link: www.lawyrs.net/llmguide/8

English Lawyers
www.lawyrs.net/groups/16/english-lawyers
Signup link: www.lawyrs.net/llmguide/16

Pakistani Lawyers
www.lawyrs.net/groups/45/pakistani-lawyers
Signup link: www.lawyrs.net/llmguide/45

Africa Business Law
www.lawyrs.net/groups/18/africa-business-law
Signup link: www.lawyrs.net/llmguide/18

Brazil
www.lawyrs.net/groups/65/brazil
Signup link: www.lawyrs.net/llmguide/65

Abogados Mexicanos
www.lawyrs.net/groups/46/abogados-mexicanos
Signup link: www.lawyrs.net/llmguide/46

Oxford Alumni
www.lawyrs.net/groups/23/oxford-alumni
Signup link: www.lawyrs.net/llmguide/23

Delhi University
www.lawyrs.net/groups/72/
Signup link: www.lawyrs.net/llmguide/72

I cant believe its a law firm Fans of Lionel Hutz
www.lawyrs.net/groups/48/i-cant-believe-its-a-law-
Signup link: www.lawyrs.net/llmguide/48