Nice site, definitely looks like a good place to go to quickly compare parts. Should also be a great resource to give rookies once it's complete.
It would be great if there was a category/filter for the published weight of items. When you're trying to narrow down your choices between several similar products, weight can play a huge factor in decision making.
Also, I'll add a +1 to adding The Robot Space, they're great for getting Vex parts fast in the Northern Midwest (especially Michigan).