Wiki Books

http://en.wikibooks.org/

part of the wikipedia family

http://en.wikipedia.org/

VOIP SkyPE

I've only just learnt about www.skype.com Internet Telephony that really works. I tried VOIP years ago but before Broadband it was pretty useless. It's completely free PC to PC, but you have to pay 1 Uk penny a minute to phone Europe, the USA and Australia and a bit more to other countries.

If need to phone abroad you MUST try it!!