Have recently come across a couple of great image hosting sites. I've been using Imgur a lot lately, but they have filesize restrictions and the images are also converted after upload in a way that downgrades quality. Sites like photobucket are even worse, I quit using photobucket a long time ago after I noticed my custom dvd covers always looked like crap after uploading there.
These two sites both preserve full image quality, and allow large filesizes.
I really like 3ezy because they have a max filesize of 7mb, which is very large for an image, and they also allow unlimited hotlinking so you will never see any of those annoying thumbnail graphics saying bandwidth usage exceeded instead of displaying your image. You do have to provide an email address and they email you the image links.
Another good one, but filesize is 5mb, and they do have hotlinking restrictions. They make you link to their page for downloading the fullsized image, and if you try to link to the fullsized image it will display the annoying thumbnail message after only a few people view it. But still pretty good
Just thought some folks here may find those sites useful, neither require account registration or anything