If you do a lot of compiles (Gentoo Users ... take note!) then DistCC is just what the doctor ordered.
The Documentation is pretty good, and the results are great.
I have a Gentoo install on a PIII 800, 768mb RAM machine ... I distributed the compiles across 3 other machines (P4 2.0 ghz winXP, 1gb RAM...Dual P4 2.4 ghz debian, 1gb RAM...Dual PIII 1.0 ghz Win2KServer, 1.5GB RAM).
I did a compile test of the 2.4.22 gentoo-test-sources kernel (Make dep, make clean, make bzImage). I went from 15 Minutes 31 Seconds to 2 Minutes and 48 seconds!
Installation is straight forward. In debian, apt-get distcc gets you the latest version. In gentoo, emerge distcc.
This is an awesome utility....
Here is a How-to and another one for gentoo users.
Another great feature is that you can install Cygwin on windows and then install disctcc and use windows machines to help compile your Linux code! (2 of my distcc machines are Windows based).