Edit 2015-06-12. Updated the layout slightly to match the latest schematic. Anode of D7 moved down two rows.

Here is another very nice compressor / overdrive. This one is a brand new creation from Sam Hay, the inventor of the Cherub Chorus that I posted a layout for earlier. Read more about it in the original thread here.

For schotty diode I used a 1N5817 in my build with good results.

Here is an old circuit from Elektor, a dirty compressor and distortion in one. I was surprised that this one actually sounds really nice. The compression goes from fairly clean and subtle to very compressed and dirty. The distortion isn't bad either. :)

I didn't have a BF256C, so I tried both a 2N5457 and a BF245B insted with good results. Just keep in mind the pinout. 

Here is a layout for a very cool compressor. It's a DIY offering by HEXE Guitar Electronics and a original design based around the TDA7052A chip. Here is a demo-video by the creator

The Carlin Compressor (aka Compressor/Fuzz) is a swedish cult classic built by Nils Olov Carlin in the 70's.Read the background to the compressor by the creator here. Have a look at my completed build here.

Note: It's important to set the trimmer just right, there is a small sweet spot - 
Set the pots to maximum sustain and minimum fuzz and adjust until it's not too noisy. 
Turn it up if you want more agressive compression/fuzz (at the expense of noise)

I noticed after doing this layout the moody sounds offers this one as a DIY kit or seperate PCB.
Check out moodysounds.se