Tripod:
I use a Feisol. Great price for a carbon fiber tripod, very sturdy but light. I also have a Bogen 3030 head. Some bigger names for tripods are Bogen/Manfrotto, Gitzo, Slik. Advice: don't go too cheap on a tripod as that's your support for your beloved camera. As long as you stick to those brands I've mentioned, you can't really go wrong.
Wide Angle:
When I had my 20D, I used a Tokina 12-24 f/4 for my wide angles, and I absolutely loved that lens. It had great corner sharpness, minimal distortion, and the constant f/4 aperture (as opposed to the Canon EF-s 10-22 and Sigma 12-24). If I were you, I would definitely look into that lens.
Telephoto:
I recommend the Canon EF 70-200. I need low-light performance so I got the f/2.8 version. If that's a little too pricey, the f/4 version works out good. I've shot with the f/4 version and I like the images that come out just as much as my f/2.8.