Fedora on my workstation for development, I'm more comfortable with the administration since the tools are similar to RHEL. I prefer to use a separate mac laptop for VOIP, video chat and powerpoint/keynote, and whatever else.
12.04 had horrible performance issues on my machine when I tested it and the overall UX was poor and too dumbed down.
IMO, the whole Unity/Dash thing sucks to no end. It looks like the Ubuntu guys and me have different views on the purpose of a personal computer.
When I feel like upgrading my system, I'll probably look elsewhere (Xubuntu, Mint, Debian…) anyway.
But I'm planning on playing around with the new Enlightenment when I have some more free time.
Ubuntu 12.10 on a netbook
Fedora 16 runs on my school's labs