I haven't really converted anyone, which is a bit sad. My brother is a huge gamer, and he has a nice PC, so he would just be unhappy with a Mac. My Mom won't give up AOL, but with some tips from me she has managed to keep her Toshiba laptop running perfectly without spyware. My dad is an artist, he's been using Macs for 10 years so there's no need to convert him.
As far as my friends go, my 12" PowerBook has definitely intrigued them. My roommates always talk about how cute my computer is, and how it always works better on the internet. My best friend wants to buy an iBook when her bottom-of-the-line HP notebook finally dies so that's pretty cool.
The one that pisses me off is my other best friend, who just recently bought a (ginormous) 17" HP computer that is too huge to carry anywhere and that was dead and bogged down from spyware two weeks after it arrived. She says she needs to have this system for Photoshop....I tell her she's crazy. Hopefully she will see the light.