I use two wikis--a DM-Wiki and a Player-Wiki, to organize my campaign. The DM wiki contains, obviously, all the spoilers for the campaign and I don't share that link with my players (it's also basic authed to keep everyone but me out). The Player-Wiki is something that the players have complete access to. I also ask my players to keep their character sheets there as well.
So, I do allow laptop access, but I ask that my players only use things like the SRD, PDFs, the Player-Wiki, Excel, etc.. Having said that, my players *still* find things to fidget with during slow parts of the game. But at least I have their attention (mostly). :-)
I use my laptop regularly to run my game--I need access to my DM wiki, plus I use Turn Watcher (http://www.turnwatcher.com/) as well (okay, so I'm biased--I wrote the application). However, I also like to keep a single page "cheat sheet" on a clip board with the vital gaming stats on it for quick reference. I do *not* like having my nose in the laptop because as soon as I do that, I lose my players' attention. I only go to the laptop during encounters to use Turn Watcher to update the next character turn, manage running effects and damage. Doing this is pretty quick, so I don't keep my attention rivetted on my laptop for long.
My wife, who plays in my game as well, prints out her character sheet, and puts her spells on the back of the sheet, including DCs and everything pre-calculated--this keeps the game running faster since I don't have to look up the spell when she wants to cast it.
I guess I do a sort of balancing act between computer and paper, but I find the computer is just another tool, not a replacement for a full DM's attention. Otherwise you might as well play an online game. :-)
Other than the DM using software such as Turn Watcher, mapping/tile programs or pdfs, i really don't think laptops belong at the gaming table. With that said, as a DM i don't actually own a laptop, and the only player who regularly brings his pretty much only uses it for refrencing pdfs from third party publishers.
Here at home on my desktop, I have a plethora of third party pdfs purchased from 3rd party publishers downloaded from here as well as places like EnWorld. So, I am totaly into tech for the game, but not sure it belongs at the table in all its force and glory (read; MAJOR DISTRACTION).