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My main thing with my iMac is my photos. I'm a photography junkie. But other than photos I use GarageBand, iTunes, and YouTube video downloading.
 
Lots of stuff. Mostly media and school stuff, but I'm also a heavy user of Photoshop and the like. Occasionally, I play around with iLife/iWork...
 
Probably what most do with theirs. Email, web, iphoto, itunes. Some home photo and movie editing. My macbook gets used for work when I'm on the road. Unfortunately, I do have to boot into Windows for this one stupid program they make me use. At least I can still use my Mac.

I also use my iMac when maintaining my servers. I like that I can pull up a terminal, ssh into a freebsd or linux server and run an X-windows program without having to install any additional software, like cygwin.
 
My mac is mostly for the standard web, and office tools.

I have been thinking of selling my G5 PowerMac to go to aniMac because I really don't need the resources it provides for my simple computing needs.
 
I do all around kinda stuff...web, office, some aperture work, and lots of email. .Mac is great for moving stuff between computers....yes i know i've sold my soul to Apple...
 
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