Listmania!
A Decent 20D Startup
By an Amazon.com customer
Canon EOS 20D 8.2MP Digital SLR Camera (Body Only)Canon EOS 20D 8.2MP Digital SLR Camera (Body Only)
Buy new: $949.99 / Used from: $399.95
a very good camera body. uses a APS-C sensor, so the crop factor is going to be 1.6x compared to full frame offerings (ie. EOS 1D series and the EOS 5D)
Canon EF 70-200mm f/4L USM Telephoto Zoom Lens for Canon SLR CamerasCanon EF 70-200mm f/4L USM Telephoto Zoom Lens for Canon SLR Cameras
Buy new: $605.06 / Used from: $544.79
awesome telephoto zoom lens. L-series glass with 1 CaF2 and 2 UD elements makes for very crisp imaging
Canon EF 20mm f/2.8 USM Wide Angle Lens for Canon SLR Cameras Canon EF 20mm f/2.8 USM Wide Angle Lens for Canon SLR Cameras 
Buy new: $427.01 / Used from: $350.00
good general purpose wide-angle lens. offers up good photos, but with APS-C cameras (1.6x crop factor), it turns into a 32mm standard lens, but still views at wide angles very well
Canon BGE2 Battery Grip for the EOS 20D and EOS 30D Digital SLR CamerasCanon BGE2 Battery Grip for the EOS 20D and EOS 30D Digital SLR Cameras
Buy new: $268.00 / Used from: $149.99
gives you the expandability of having 2 batteries, as well as the advantage of vertical controls (shutter release, wheel, focus point selectors, etc) for portrait shots. a necessity in my opinion.
Canon BP511A 1390mAh Lithium Ion Battery Pack for Select Digital Cameras and CamcordersCanon BP511A 1390mAh Lithium Ion Battery Pack for Select Digital Cameras and Camcorders
Buy new: $43.72 / Used from: $19.85
second battery if you purchase the battery grip
Tiffen 67mm Photo Essentials Filter KitTiffen 67mm Photo Essentials Filter Kit
Buy new: $59.78 / Used from: $49.00
67mm filter kit for the 70-200mm f/4.0. includes warming filter, circular polarizer, and UV protector.
Tiffen 72mm Photo Essentials Filter KitTiffen 72mm Photo Essentials Filter Kit
Buy new: $94.62
72mm filter kit for the 20mm f/2.8, same contents as above. tiffen makes great glass.
Canon Remote Switch RS60 E3Canon Remote Switch RS60 E3
Buy new: $25.33 / Used from: $15.99
simple and effective shutter release cable for long exposures (night photography, astrophotography, etc)
Canon Deluxe Photo Backpack 200EG for Canon EOS SLR Cameras (Black with Green Accent)Canon Deluxe Photo Backpack 200EG for Canon EOS SLR Cameras (Black with Green Accent)
Buy new: $42.80
a nice little equipment pack. i personally have the dakine sequence pack because i'm not too hot on having "CANON" emblazoned all over a bag with a lot of expensive equipment in it.
Kingston CF/4GB-S 4 GB ElitePro CompactFlash Card (Retail Package)Kingston CF/4GB-S 4 GB ElitePro CompactFlash Card (Retail Package)
Buy new: $25.44
a quality CF card, lots of storage space, and FAST. can store about 400 8.2 megapixel RAW images