Left 4 Cake!

[metacide]

Recently I was convinced to download a few custom made campaigns inclduing one called Left 4 Cake. Largely inspired by Portal, and when I say "inspired by" I mean "a huge rip off of". Even so, it was a lot of fun to play. The never ending burnables caused so much destruction O.o

Others include Evil Eyes, or something like that, which was a completely original creation so far as I could tell. A few pathing issues but nothing to scoff at.

City 17 was a Half Life map filled with zombies, very amusing to see the soldiers from Half Life here and there.

Any add on campaigns the rest of you would recommend?
If you dont have these yet you can get them from Left 4 Dead Maps.