I am an American attorney - got my J.D. here in the States about 2 years ago and am currently practicing. I'm looking into getting my LL.M. here as well in Intellectual Property. I don't have a science background and was hoping it would bolster my credentials. But I wanted to know whether my LL.M would be worth anything overseas. I wouldn't be adverse to working outside of the U.S. but would my education (both J.D. and LL.M) be of value to let's say a UK firm or an Australian?

In the first instance they are more likely to be interested where in the US you are admitted: they will be much more interested in NY bar / California bar (the latter for technology work) than an LLM.

i think LLM in IPR would be a good option for a person with science engineering or any technical background. persons without such background often get restricted to their work in trademarks and copyrights and barely get hands on experience in patents and related issues. Further, i think U.S. JD and LLM would be renowed world wide if u have certificate of practise from the NY bar as its more demanding. Consider cardozo shool of law at new york if u r planmning for LLM in IPR.