If you mean a spam forum, that's an excellent idea.
We have this on another forum that I use, and it keeps all the spam/worthless posts out of other parts of that forum.
I know that this would become a moderating nightmare, and I'd suggest that to counter the almost-inevitable surge of rule-breaking spam, a new team of moderators would need to be appointed, who would have the power to do the "Please see rule #...." thing, and alert Skuzzy/any other HTC staff member of repeat violations.
Also, if this were implemented, it might be a good idea to:
a) disable all posts in this new forum from adding to post counts, and
b) make it so that the rules relating to double-posting don't apply to this new forum.
<S>
Yossarian