From my experience in dealing with online photos Smugmug is the best solution out there. They don’t have the limitations that many other sites have, they are consistently fast, and they have awesome support. Overall I think it is well worth the money. If you get a higher tier account they even let you embed smugmug within your own site and change the css to make it look however you want. This is pretty cool. They also have a neat web services API so that many common tasks can be scripted or done through an external app. For example, I upload my photos through a desktop app because I think it is much easier and more flexible.

Give it a try. Sign up with my coupon and you save $5. Put k3nzPigCBr5qk in the referral code box when you sign up.