Started recentky is the SpeccY SourcE Library (SYSEL for short) by Dron of demogroup K3L. It's an idea that was going around back in July. Remember the post on High Technologies? Well, that site hasn't appeared (at least I can't find it), but this is much the same thing.
It's basically a point to grab source for various Speccy-relating things. There are routines for disk-access, FX, maths routines, etc. It's currently only in Czech, but it's fairly easy to grasp what's going on. Worth a check (Czech!?).