Loving the heck out of Cardinal Quest and Zaga 33, also really like 100 Rogues... What are some other ones that are fast and fun. Really like how fast zaga33 is, but wish it had a leveling system for fighting the baddies vs running from them. Cardinal quest is also super fast and easy to pick up, I'm sure there are a bunch more! Whatcha got?
We already had several threads about this... look here: http://forums.toucharcade.com/showthread.php?t=148028&highlight=roguelike and here: http://forums.toucharcade.com/showthread.php?t=82112&highlight=roguelike - there's everything you need.
Nethack. (There. Saved you the trouble of diving into those threads that Mr. Vovin so graciously posted. ;-))