Favorite Zoom:
Sigma 24~70mm f2.8 EX DG
Great range with some walking I can get 90% of what I need. Great sharp optics and great price. Also it's fun having a macro zoom. I did just buy the 70~200mm f2.8 EX DG though so my favorite zoom might change. I like them both but for 2005 I would definately say the 24~70mm because I hardly used my other tele zoom.
Favorite Prime:
Canon 100mm f2.8 macro
Love being able to focus so close and make intersting subjects out of mondane items. This has helped me a lot in my PAD since I go to and get out of work in the dark. It lets me find a somewhat interesting photo inside at night. Also a very sharp lens weather using it for macro or not.
Ben