When the question contains a link, such as
[Patent Application #20120225162](http://www.google.com/patents/us20120225162)
the system should tag it with us20120225162. This tag should be special, like a moderator tag on meta.
Edit: I don't think these tags should count towards the tag count, otherwise you run out of space very easily.
The automatic tagging might be fine as a suggestion but doesn't handle all cases. A question like “Is Patent A prior art for patent B” would be tagged b prior-art but not a.
Why would the tag be special? Do you mean a distinctive color (that doesn't seem useful: the letters+numbers pattern is already visually distinctive)? Do you mean the tag should be restricted, in which case I have no idea why it would be?
