If there is, I don't know about it. I scan the app store about once a month just to see what's new.
I picked up two games yesterday.
Burger - You're basically an expeditor for a fast food restauant. You prepare custom orders as fast as you can and see how many you can make. You get month and tips depending on how fast you are. Pretty cool time waster.
Stickman Basejumper - You basejump off buildings and try to land in a specific spot near a flag. It is also timed so you can't just jump over the top of it and pull the chute. Also a good time waster.
They work well, when I'm on the subway for 20 minutes or on the train ride home if I don't feel like reading. To top it off, both are free.
I'm looking at
Speed Night. It looks pretty cool and gets good reviews. It's also free. Lots of good time waster games are free. That is awesome.