Here's a product (or range of products) I have been looking at for a long time but never really find the time to go and check it out myself.

Here's the version I would most likely buy myself. So rather than reviewing the top of the line RC-50 that people may never actually buy (even though it would make a sweet prize), it would be nice to see what this one does:

Boss RC-20XL

http://www.sweetwater.com/store/detail/RC20XL/
Compact Phrase Recording and Sampling Pedal with Undo Function and 16 Min Recording Time Whether for use on-stage or at home, the Boss RC-20XL will add depth and excitement to your performances by allowing you to layer phrases in real time - as many stacks as you like - until you fill up the 16 minutes of ample recording space on the RC-20XL. Explore the expressive options of sound-on-sound...

Also this type of pedal comes up fairly often in the forums.. so may be a good place to start.