I like Pix.ie - there is a link to mine in my sig.
The sizes are good for TP - means you don't have to resize before uploading. I used to use photobucket which I wouldn't particularly recommend, I found the quality suffered and mine ended up very messy with folders all over the place (which is obviously my fault but I just didn't find it that easy to use).
Also use flickr but have now got the point where I need a pro account to show everything I've uploaded - which involves paying. Link to that is also in my sig.