I use smugmug to post all my photos on the web, I also use it for family to print photos I take of them(so much easier than printing for them!) I use them for when I sell a full sized copy of a file to a client too, as then if they print it, at least it won't be from walmart where they'll turn the blacks green!

I have my site hosted and a sales gallery for proofing for out of town clients and for after the sales session.