Bristol University is one of the few places you can study Sign Language and Deaf Studies in the UK. The Centre for Deaf Studies there has recently released a web site designed for using on mobile phone to help you communicate with deaf people.
Go to www.mobilesign.org, find the word you want, and it will play a video of the sign. How fantastic! Go and bookmark it now, then when you're sitting in a boring meeting or on the bus you can learn more words! Why not learn a sign a day? :-)