Hey Lee, we set up some clients on SmugMug as a subdomain and they're enjoying it. They run a motorcycle tours company called Rocky Mountain Motorcycle Holidays and wanted a way to post their own photos, and also let their guests share their photos.

We used the subdomain setup and created a gallery of motorcycle tour photos integrated into the overall site. The only complaint I'd have is that sometimes the SmugMug site seems slow, particularly when we first set the account up.

Apart from that though, it's been a great experience and the only service we could find that allowed non-members to contribute photos.