Since the Kebco and Yestertoys threads have been getting a lot of posts, I thought I'd start one where people could list who they've dealt with and what their experiences were. Kind of an informal reference forum for those who wish to know who are the good on-line etailers. Here are mine:
Entertainment Earth -- I've had good experiences with them (except for the Saga 2003 Wave 13 thing). Everything they've sent me has arrived mint. Email communication it top notch.
Yestertoys -- I've only ordered the new X-Wing from them but it arrived mint. They don't do a very good job communicating via email, but if you call their 800 number, you get right through. I had to call them to adjust the price of what I ordered after their discount announcement for Wizard World, but everything worked out.
DNSToys -- Great communication via email and fast shipping. I received an order from them that was damaged. After emailing them they promptly sent a new one in the mail even before I could send the other one back. And they credited me back postage for sending back the damaged one. Even after this I'd still use them again because their customer service is top notch.
Action HQ -- Fast, efficient, and friendly. I've only ordered from them once, but for being in Japan, shipping was fast and reasonable. Everything came wrapped in bubble wrap and delivered fine. Email communication was also great.
KB Toys -- Ordered the new Tie Fighter from them. It arrived on time (after the initial date release change) and in mint condition. There was a sticker to remove off the package plastic but it left no residue. I've also ordered the interactive R2 from them. Shipping was fast and contents well protected.
That's all I can remember off the top of my head. I have an order pending from Collector's Gallery so I'll post about them when I receive their package.