Today? Dont you mean every day?
My dual G5 and mini G4 are my main machines, even though I have some newer Intel's. Those just aren't fun. I use my intel iMac for printing wirelessly, and its other use is as a "TV" using PlutoTV app. Otherwise it sits powered off 95% of the time.
My dual G5 is used for development and daily browsing, YouTube, Twitch, email, irc etc. The mini G4, pretty much the same. If the dual is compiling stuff I let it be and use the mini for the above. The PowerBook sits in the living room as my couch computer, which also handles the above, and the keyboard is soooo much nicer than my MacBook's. I really only use my Intel Macs for devel/building arctic fox, spiderweb and interweb for that platform. Otherwise I always choose one of the ppc Macs first.
Cheers