Is there a "viewer" node to see values coming out of Math Nodes?

Hi Guys,
Let’s say you have a lot of connected math nodes. Sometimes, a comp or texture doesn’t behave like you expect because you’ve got a lot of math nodes connected. Trouble-shooting would be so much easier if one could see the numerical output of a node or chain of nodes. Any ideas?
Cheers, Def

Simply connect it to viewer node and check values in uv image editor. Select viewer node there and left click on the part of the image. At the bottom you’ll see the values

Excellent solution from the man himself! Thanks a lot Bartek! I love your compositing training series from CGCookie by the way. All the best, Konrad