this is a remake of my old thread[Don't Complain, i deleted old one =P[well, tried to but it very much failed]]
use photobucket and upload images. get the image url, and BAM! you can post images on the form!
my favorite site too =D
flickr also works pretty well, although apprently their "terms of use" would have you always include a link back to the flickr page as well as the embedded image (preferrably using the picture as the link, but I don't think that's possible here?)
Google's Picasaweb doesn't work so well; they don't provide a simple URL-linking capability, and what you can extract from their "embedded picture" capability goes "stale" pretty quickly. They explicitly claim not to support the bare-url style of hotlinking (I asked: http://www.google.com/support/forum/p/Picasa/thread?tid=08667e121dca6f04&hl=... Sigh. Took me a while to figure out, too, so it's not like this picture hosting stuff is trivial and universally known; I'm happy to add photobucket to the list of "good" sites.)
Anyone want to chime in on other free picture-hosting sites? What about other types of files (zip, pdf)? Some of the file-hosting sites I've been pointed at have been REALLY obnoxious wrt ads and pop-up windows and such.
...using the picture as the link, but I don't think that's possible here?
It is 
[url=http://arduino.cc/]
[img]http://arduino.cc/en/uploads/Main/arduino316.jpg[/img]
[/url]
that helped xD
Anyone want to chime in on other free picture-hosting sites?
One thing that a lot of people overlook is that their ISP usually provides them with a free personal website (something like www.comcast.net/~username) You can upload images there and link to them.
Be sure to check for bandwidth limits: Cox gives me a free 50M website, but only 1G/month of free downloading. Posting a minute or two of video of your new robot navigating the bedroom could use up a gig in an afternoon if lots of people watch it.
Ran
I think that the URL that you put in MUST end in a valid photo extension. For example
NOT:
This little issue bollixed me for quite some time with Google picasa.