Polar Align with a WebCam....
http://wcs.ruthner.at/index-en.htm
Push Here Dummy autoguiding....
http://www.stark-labs.com/phdguiding.html
Disclaimer - due to cloudy wx in Sydney I have not been able to use either of these tools yet -but they sound promising....
Enjoy - and if you use them please share you experiances - I will...