Hi Mowicus, This is our project: http://tech.groups.yahoo.com/group/sgl_observatory_automation/ the part of the project that I am coding/building is the dew heater control, to keep moisture off the objective (Front lens on a telescope) while we take long exposure images. the main part of the project at the moment is the focuser controller, it ties in with the astronomy software to allow us to do things like autofocus (or at least it will do when we're finished). Most of the stuff in our project has been done before, we're just pulling it together to work with newer kit and a cheap fairly robust development board platform, arduino gives us that and a basis for other projects.
There are quite a few random DIY astronomy projects and electronic mods around, some really phenominal ones (Given the technology), the best 2 or 3 are EQMod, the Philips Toucam/SPC900NC Long exposure/amp off mod and anything that involves a canon EOS DSLR (IR Filter removal and replacement, peltier cooling/coldfinger mod) 
EQMod takes a standard skywatcher EQ mount and adds (for free) so many software enhancements its untrue.
The long exposure mod is a little add on circuit that allows you to control long exposure on a philips toucam/vesta/spc9009c webcam via the serial port.
IR Filter removal on a canon (or nikon) DSLR increases the cameras sensitivity to Ha by about 5x, reducing exposure time and noise in the process. The peltier mod cools the CCD/Cmos sensor reducing amp noise to a point where its almost non-existent 
Head over to http://stargazerslounge.com/ and take a look around in the equipment>>DIY section, there are quite a few mods, one guy is working on an observatory dome automation project where the opening in the observatory roof tracks the orientation of the telescope so he doesn't have to continually move the opening himself throughout the night.