I have found that most free services are worth what you pay for them. Just yesterday there was a thread on dpreview.com where a new photographer wanted comments on a few shots. There were several "I can't see it", "I can see it", "try this", "try this" back and forths. Finally came the inevitable - "go here to see it", requiring me to sign up for an account to see the pix. Ack!!
The majority of photographers on dpreview - who are obsessive about photography as we are about FF - use either smugmug.com or pbase.com. The choice comes down to how you use it.
Pbase has unlimted bandwidth but restricted storage. Smugmug has unlimted storage and restricted bandwidth. I find it much easier to just upload my full resolution pictures, letting SM downsample them for the 5 available sizes. I have about 3GB of picture stored (also served as a nice 4th level backup, after my HD, USB HD in my safe and DVD's off site) in their geographically redundant storage locations. The same storage would cost me about $180/yr on Pbase. I get 6GB of bandwidth per month and, even with heavy participation in photo forums, I've never used over 2GB. In fact, in the 2 years I've been participating, I've seen the "exceeded bandwidth" message from 1 member, 1 time, and that was back when the limit was 4GB/month.
The SendToSmugmug application makes uploading as easy as right-clicking on the folder containing your pictures. Or you can set up as many multi-level, password protected, public/private, watermarked, visually-themed, Google-mapped subdivisions as you would like.
Of course there are many free sites - flikr is probably the most popular, plus photobucket, webshots, etc., etc. The pay ones offer free or money-back trials, so read through the features and figure out which couple suit you best. Then give them a try. My spreadsheet from 2 years ago had at least 20 options listed, which I narrowed down to 5 to try. I'm sure there are many more options now.
For more reading, try these:
http://forums.dpreview.com/forums/re...ssage=19682595
http://forums.dpreview.com/forums/re...ssage=19645564
http://forums.dpreview.com/forums/re...ssage=19383089
A quick pass through these shows zenfolio moving into a solid third choice.
If you like SM, G171UaFcXSOjA gets you $5 off (full disclose - yes, I get an account credit for this, but I have enough credits to last me until 2015
29 of the 31 referrals who have tried SM have stuck with it - I think that says something...
http://richs.smugmug.com/gallery/579469