As I wrote a few days ago I was considering to update my desktop PC to run Linux, so I decided to give it a go - and I'm happy I did :)
The performance is so much better than what I'm used to - I can do a full build of Fennec, from scratch, in 10 minutes, it used to take about 40 on my laptop. Actually doing the build is the first time I have seen all 4 cores of my CPU max out, I'm used to running Windows Vista on this machine, never seen the CPU usage go above 60-70%.
A full rules based source compare of two source trees is accomplished in 5-6 min with Beyond Compare running in Wine.
The only problem I have seen so far is that Source Insight running under Wine sometimes fails to open the menu when I use my mouse (actually my wacom tablet), but then it's probably better anyway if I use the keyboard short-cuts :)
I'm running a 64-bit version of Ubuntu so need to do some magic to get scratchbox running - but until then I can continue to use the laptop for doing these builds.