Believe it or not: The Quest is my favourite to go to for minutes. The main game of course is very involved, but there is a genius cardgame (where you can earn all the money you ever need) there which helps split 5 minutes pretty well. Game time is one hour too, so if you have to kill time between night and morning schedules, it is perfect.
Minigore, My Brute, Bejeweled 2 on Blitz mode.
iPhone 3G 16g / 2.33 GHz 17" MacBook Pro
i must add hook champ to my list ( i know i can edit but in this way more people read this and how great hook champ is)
Tap Tap Revenge 3, Frootrees or Sky Burger
Shigzeo - I love The Quest and I asked the devs about that card minigame, they were once considering making it a separate app, wouldn't that be awesome?
Sorry for any spelling mistakes in my posts, I'm using an iPhone to write them
I play Rat on a Scooter XL at least five times a day! Really addictivie!