Nope. You can't do this. It's to prevent abuse by spammers, which would be rampant if this were permitted. Remember, the site has to work well in a 99.99% automated fashion.
If you allow such links, the spammers flock to a site and ruin it.
I will be corrected if wrong, but I do not think so. I agree that links and more would be a very nice addition to the description area, but AFAIK you cannot link, modify text, or precipitate any html in the description area.
