I bought a mac when the mini came out. It gives me the chance to try a Mac and not have to spend a ton of cash + run something new. I have wanted to try the Mac since OSX came out.
I really like it so far. I am honestly thinking of buying a nicer Mac and switching completly. I think everyone has covered the reasons OSX is nice to use so I wont rehash. But major factors for me were my work VPN software is compatible, Lotus Notes, Terminal Server client, native X to remote dispaly all my unix apps, and the major games titles I play are available on Mac. Heck if my mini could run WoW good enough (which it don't) I would probably not boot my linux box OR my Windows box again :). My decisions were in no way influenced by IPod.