Gryffindor Student - if you're thinking of using one from another site, firstly check whether you have permission to use it (unless the creator has clearly stated that an image is Public Domain, copyright exists on all creative works, no matter whether there's a copyright notice visible or not). For example my little fractal avatars are perfectly OK to be used by folks on the forum here, but if another site uses them without asking me, they're breaking my copyright, and I could legally do very nasty thingies to them.
Chocobo - Thanks - glad you like the ones I've picked! I'll check out the uploading feature next weekend, that way (if I can get it to work) you can upload any image you have permission to use.
If I do activate the uploading feature, folks are going to need to be really careful about copyright of images though.
Quicksilver - ack
yes
In ths case, Angelfire's servers have automatically redirected the intended image to an "image hosted by Angelfire" pic, which is their way of saying "oops - you shouldn't hotlink to images on our servers". I'll edit the hotlink out in a couple of days