There is also an outstanding (and ultimately heart-rending) Beauty and the Beast crossover. It's excellent, and the bad guy turns out to be something of a dork after all.
There is a "no Smallville fic" rule on these boards, but as long as people from the Lois and Clark universe are directly involved in the story (not necessarily the central characters) the story can be posted. At least, that's my understanding of the rule (such as it is). If that's incorrect, someone please let both bob and myself know.