Superhero Gameland: Low prices, but they shipped the Shadowrun 4th book I ordered in a motherblooming thin cardboard envelope. No packaging materials, no nothing. However, they did send me a new, intact copy when I complained bitterly to their customer service, and they were courteous. Go ahead and shop here, but submit comments with your order to the effect that you want your item to be packaged properly. Their shipping speed is also good.
Noble Knight Games: Great selection (especially of out-of-print materials), great email updates that actually are interesting, awesome customer service, low prices, super-fast shipping speed. Noble Knight is the best online gaming retailer out there. One drawback is that despite the selection, you won't always find what you're looking for.
RPGShop: RPGShop is the Wal-Mart of online gaming retailers, without all the evil. They have decent and fair customer service, a decent selection (but ONLY of in-print items), decent prices, and decent shipping speeds. Sometimes, their in-stock status notifications will be inaccurate. A very average store, but not seriously lacking in any area.
Stiggybaby's went out of business recently. Shame.Do or Dice: You know, I don't think I've ever ordered anything from this store. Their selection is OK, I guess. If anyone has a buying experience with this store, let me know.
CCG Armory: Mediocre selection, lengthy shipping times, and lacksadaisical customer service aren't doing CCG Armory any favors. The only thing they have going for them is low prices. I'd avoid it like the plague (and I do)!
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More to come later.