Hello LL. I've been using Zenfolio for my client proofing page for a little more than a year now and have been really happy with them. I tried a Bunch of different 30-day trials and was previously with Digilabs. Zenfolio has been a good fit. I like that clients can enter print orders, pay with a credit card, and I get an e-mail with thumbnails and file names (I do my own printing.) I almost went with SmugMug, but am happy to have landed with these guys instead. I wouldn't use the site as my primary Web portfolio, but I think it integrates nicely as my client page.
Here's the link; it would be interesting to hear what you guys think of it:
http://mattbeardsleyphoto.zenfolio.comand a "review" of the service on my blog, including my referral code that will get you a $10 discount:
http://mattbeardsleyblog.com/2010/08/06/on...-with-zenfolio/