Sigma 70-300mm F4-5.6 II APO Super Macro for Canon AF.
This zoom is BRAND NEW - I did a comparison to pics from an image-stablized zoom that I already own, and realized that for my needs I need the stabilization (which matches the conclusion that my friends have reached). ;-)
Seriously, this zoom has been outside twice and is immaculate. All original warranty cards, packaging and materials. It has been getting rave reviews lately on a few D/SLR boards.
This lens goes for around $170 or so at many mail order places. I'll sell this one for $140 and I'll pick up shipping (ground CONUS) and insurance.