Essential sites
Don't miss this ones !!!
http://www.bbastrodesigns.com/cot/cot.html
Mounts
Some useful links about german equatorial common mounts :
http://overton.tamu.edu/rdb/CG5/
http://www.cloudynights.com/mounts/cg5.htm
Software
Motor's
What is inside the motor box : http://www.pulsemotor-usa.com/PFGHSpecs.cfm?id=4
Good info about SP mounts :