Nikki converted me to Twitter, amongst other things.
This site is very interesting, but could be addictive I warn you now!
www.twittervision.com
If you want to follow an Adwords Professional on Twitter, try
www.twitter.com/AdwordsPro
You'll get tips, advice, offers, and insight into the world of someone who lives and breathes keywords & Adwords ... but then I would say that ;-)
Rob Hadingham
Adwords Professional & SEO Craftsman
Advice & tips:
Adwords Expert on FreeIndex
Follow me:
AdwordsPro on Twitter
Adwords Professional Directory at ecademy
Adwords Professional Status at Google