Links

Bunch of stuff, unsharp masking PS is cool

http://starizona.com/acb/ccd/software/soft_proc_ps.aspx

Processing dust pics, also good tutorial on stretching.

http://sgastrophotography.zenfolio.com/p968488012/h184a2db3#h184a2db3

Assorted techniques in PS

http://www.waid-observatory.com/articles.html

HLVG for getting rid of green in pics

http://blog.deepskycolors.com/archivo/2010/04/26/hasta-La-Vista-Gre…

Found this to be the best info. on shooting darks,flats, etc click on FAQ

http://deepskystacker.free.fr/english/index.html