Just posted this elsewhere but I'll re-post it here to...
I'll say it again, EXPOSURE MANAGER!!
They are by far the best out there!! I've used a few companies and they blow everyone out of the water. Once you get used to it you can costomize the site easy, but takes a bit of know how, you can get an easy url (yourname.exposuremanager.com), and the service is excellent.
The biggest draw to them for me is the quality of the prints and products! Places like Printroom/Smugmug/Shutterfly use automated systems that just print the photo, no adjustments, done - if it sucks oh well! Exposure Manager has an actual person look over the photo, adjust it if need be to fit how there printer works, etc. They also ONLY deal with event photographers, so not any joe can get a picture printed through them like other places. Everything they deal with is pro, so they know how to handle it. Besides that, EXCELLENT packaging, best I've ever seen.
Every time I talk about them I sound like an advertisement, I don't work for them, just extremely satisfied. I get everything printed through them.
OH, and to top it off - they are the cheapest out there and also have the lowest commission.
EDIT: Look to see if they use EZPrints as there printer. Exposure Manager used to, I used to, then they opened up for everyone and the quality went down the drain IMO. I did a test of Exposure Manager vs. EZPrints, Shutterfly and other outlets - it was NO contest. EZPrints just wasn't satisfactory when it comes to pro prints, maybe it's because my standards are so high, but still. 