Are you looking for some great CAD or GIS tips, tricks and routines? Well Cadalyst and Geospatial Solutions have each developed some Wikis that can provide just that for you.
http://cadtips.cadalyst.com
and
http://wiki.geospatial-solutions.com/
are two places to go. Cadalyst and Geospatial Solutions are subsidiaries of Questex, a company that produces great content. I helped Cadalyst develop the CADTIPS wiki so I am very familiar with what it can do. It has all (yes all) Hot Tip Harry Routines in it! Soon they will start adding the weekly Tips and Tricks in it. I don't know if all of the tips will be added, but I know that they will start adding the new ones to it, eventually.
Check out these sites, I feel that you will fond them helpful.