Looks like quite a good typo for Digg.com, but Overture shows 0 searches for Diugg.com and there's no other good way of estimating type-ins.
So just to reiterate what's already been said, we can't appraise this name accurately without knowing the actual traffic stats. If you're looking for a wild-ass guess (WAG) I'll assume 10 visitors a day and say $25.