One of my players has decided to return to a dungeon she thought she was done with months ago. I'm figuring out what's happened since she left, plus what's behind all those doors she never checked. It's really fun--it's like writing an alternate-universe dungeon that hides behind the original dungeon. Ever done that?
My favorite kind of encounters aren't all surprises--they're the ones where the PCs know what they're getting into (mostly) and you get to watch them scheme before taking the plunge. Re-doing a dungeon over a few levels later gives you plenty of chances for exactly that.
In other news, here's some recent things on the D&D internet I like:
-Hireling generator (via Grognardia). I'd use this if I could ever get used to having a laptop right there at the table.
-This "make combat suddenly more dramatic" idea from Monsters and Manuals. In general, I like options where players can voluntarily up the ante at any time. Plus anything involving d100 options always = rock.
-Swords and Dorkery found an interesting artist I've never heard of before.
Also, remember the Secret Arneson Gift Exchange deadline is a scant 3 days away--send 'em if you got 'em.