One-Character Crossovers: Pluck somebody from a show and put them on another show where they'd be useful -- or at least entertaining.
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Jayne Cobb gets on Oceanic 815 in Sydney and falls out of the sky with the rest of the survivors. John Locke is good at hunting boar. Jayne Cobb hunts the Others.
The Doctor shows up on Heroes. Shows them it's totally possible to save the world without being emo about it.
EVERYONE on that show would make a horrible Companion. No one's got the sense of adventure.
Monkey: Ando still does, I think. He and the Haitian are already well-versed in working as part of a tandem, so they're probably the best candidates.
Speaking of Companions, I think putting Donna Noble to work at Dunder-Mifflin would be a recipe for awkward hilarity.
Captain Malcom Reynolds shows up on Battlestar Galactica.
I'm not even sure what would happen, but it would be awesome.
Benjamin Linus shows up to recruit Jack Bauer for the new Dharma Initiative.
Monkey: Ass-whuppings and laughter, probably. Both at Baltar's expense.
I always assumed last season that NBC was looking to an eventual Heroes/Chuck/Journeyman/Bionic Woman cross over
two of those shows have been canned though...
I think Dexter should try to kill JR Ewing and fail, because JR is just too clever.
Angel shows up on an episode of "Bones"
and Willow shows up on an episode of "How I Met Your Mother"
This week on a very special "Extreme Makeover: Home Edition", the Constructicons!
Thanks, TWIGBy. That's awesome.
DEVASTATOR INSTALL TRACK LIGHTING!!
This week on "My Name Is Earl," Earl meets up with two distant cousins: Luke and Bo Duke.
Jordan Collier shows up on Heroes, letting everyone know where the promycin originally came from.
The hosts from all the horrible game/reality shows currently on network TV show up on Survivor.
They are served, boiled in coconut milk, with some roots that a contestant managed to dig up.

My pick: Dwight Schrute, salesman for Primatech Paper. Hell, an "Office"-style episode based around the Company wouldn't be a bad idea, would it?