Each day we seem to see more and more classic games being ported over to the iPhone. Some of the titles have been a success (e.g.: Scrabble) while others have found themselves being cloned over and over again (e.g.: Tetris). While we have seem similar puzzle games to iBoggle already, nothing beats the original.
Chances are you've played Boggle or something similar to it before. Basically, you're given an assortment of letters that you need to make as many words from as possible before time runs out. You're not constricted to moving just up/down, left/right, and diagonal. You can actually move from any one letter to another letter if it will make a word.
You can't overlap the letters that you've already pushed through, which does make it difficult once you've started to use up all of the words. Each new level will give you a new set of letters to dig through in an attempt to get the highest score. Definitely a game that will keep you busy for awhile.
If you don't already have a word game similar to this, then you should check out iBoggle. It's very simple and easy to use with no real bells or whistles. Considering you don't really need any of that jazz for it to be a good word game, you're all set.