imgur is great for the purpose of sharing images alone. But dropbox has many other uses, sharing any kind of file, backing up stuff, syncing devices which gives access to your notes/scripts/passwords/portable apps and their settings, collaborative group-syncing, hosting html based websites and a bunch of other stuff :p +1…
This could be considered a technical question I guess. You're correct that mostly people don't like attachments. There are plenty of free hosting sites though so that shouldn't be a problem. Dropbox, Photobucket and Imageshack are three popular ones.
Throwing my hat in for Dropbox as well. It gives you more than enough space on the free account (you can also harass friends, family, and strangers to join up for more), and it has about the simplest interface imaginable. Geddit.
Dropbox all the way. Simply drop files in your public folder. If you overwrite an image you've posted on many forums, it will be be updated everywhere + history. Also good for keeping an easy access to your files between pc's (like game saves for instance)
I personally don't like attachments just because the way my browser handles them. It opens them in the same window and when I click back any post I was working on is gone. It's killed more than a few critiques I've been working on. It's a pain to right click and choose "open in new tab" bahh... if it eats my post I don't…
Dropbox is cool, but blocked in China (that's why I'm not so much a fan of it any more hehe) Photobucket - not as cool as it used to be, but still very nice and allows direct hotlinking Imageshack - imho just terrible. stuff wouldn't load even in the "free world", hotlinking often wouldn't take you to the picture but to…