Brain game apps - how neat!

I ran across this information as I was cleaning up my email inbox (truly a very scary task!).  These are apps that help keep your mind active and making connections.  I haven't tried them out yet so I would love your feedback if you do:)

  BrainHQ-Brain Training Exercises (free)
  Brain Training (free)
  Brain Training Unotan ($2.99)

Twinoo ($.99)