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I made a simple 8-bit counter with pistons. I'm certain this has been done before, but this is my particular setup.
Front:

Side:

Top:

The individual bit counters are identical and modular (you can use as many as you want in any arrangement.)

It is easy enough to extend the length of the individual counters to work in decimal instead of binary.
Front:

Top:

The values on the decimal counter go from 0-9999 in the same space the binary one goes from 0-255. (Much more efficient!)

Here's the world file (v1.8.1) to play around with: http://dl.dropbox.com/u/43903851/Counter.zip

Could you try to make a video, very interested to see it in action

Quote from ModernSlinky

Could you try to make a video, very interested to see it in action

I don't really want to go through the hassle of making a video and creating a youtube account just for this.

Here's the world file (v1.8.1) to play around with: http://dl.dropbox.com/u/43903851/Counter.zip

If someone else wants to make a video, fine by me.

Well done. You could make it far more compact, though, by using that piston-based falling edge triggered T flip-flop...

I can't find it. It's this design, but with the torches angled directly above the pistons rather than hanging out on extra dirt blocks. There is a redstone torch underneath one of the middle blocks, so that when pistons push the solid block directly above it, the flip-flop's output turns on.

Quote from Brotep

Well done. You could make it far more compact, though, by using that piston-based falling edge triggered T flip-flop...

For the memory cells? Yes, I suppose, but I wanted the concept to be flexible such that the piston loops could be expanded to hold more blocks.

The decimal counter is done. Original post and world file have been updated.