Of course I'm far from short of hosting accounts to store images on but there's something to be said for quickly uploading a pic for temporary storage via a website, especially when it's as easy as imgjax makes it. I've used allyoucanupload.com a fair bit but I hate the fact it changes the file format to jpeg no matter what the original format was. Very strange and unnecessary.
Via Ajaxian.
Update: imagax seems to have bit the dust. I'm now using BoostUpload and Image Bin for dumping images quickly and jagbox for any file type.