In 1 Knight you need to clear the entire board with one knight.  Every other piece is a pawn and you can only use actual knight chess moves.  If you like playing chess and want to pass some time this game's perfect. 

The game does get more difficult as you have fewer pawns to remove.  There's also a move counter so you can keep track of your improvement game over game.

Another rehashed game from myHip.  This time it's memory with rubber duckies. 

Not really much more to say about this one. 

38i has created their own version of Othello also known as Reversi that offers four levels of difficulty.  Their version plays really smooth and is easy to use on the iPhone/iTouch. 

If you're new to Reversi this is a good version for you.  There are pieces of dialogue at the top of your screen telling you what's a legal move/not and if you play the easiest level you will most likely win. 

3D Shuffle's an odd but fun and somewhat tricky game.  It's like a sliding tile game in 3d where you shift the numbered pieces around to make them line up again. 

I was confused at first and the help page was a broken link but after about 5 minutes I figured it out.  If you're unhappy with the number layout just press New Game again.

myHIP.com has created a great version of Tic Tac Toe which is challenging, fun and makes you think outside the box.  It's three levels of tic tac toe where you're playing against the computer.  The three levels makes for many ways to win/lose so this game stays fun for a while. 

I lost a whole bunch at first but once I saw the ways to win I started beating the computer pretty consistently.  Have fun! 

4InARow is a slick version of Connect 4 which has been designed specifically for your iPhone or iPodTouch.  You have the option of playing against your friend or the phone and can even set the difficulty level to easy, difficult or hard.

Of all the Connect 4 games out there this is by far the best looking and playing version.  The gameplay is smooth and the computer or human option makes it that much better.  MetaSparc has a winner. 

4InARow from Flipside5 is a shiny, cool version of connect four that plays really well and looks great.  You have three levels of difficulty if you're playing the computer (beginner, intermediate, advanced) or you can play your friend. 

If you've played their other game TicTacTouch you'll get this interface immediately.  If not - no worries since the buttons are easy to understand and use. 

The game instructions say: Race your car to the finish line by erasing matching pairs of simple equations. Tap your fingers as you exercise your mind! A Racing Game is a simple game designed to keep your mind sharp. Tap on any pair of boxes that have the same value (e.g., "1+2" and "7–4" or "8÷2" and "2×5") to advance your car. The faster you reach the checkered flag, the more bonus points you earn.

Honestly, this game's good for a younger kid who wants to learn math and play a game.  If you have children they might like it!