I wanted to plug a few resources available through USITT. If you don't visit the commission pages through USITT you are missing alot of good archived information. I do wish that they were a little more "equal" - Like the Technical Production sight has links to past conference session notes, which many of the others don't - and it is a great resource.
First is the Technical Production Commission run by Patrick Immel. There are alot of great resources, including past session notes. The session notes have not yet been updated, but the slides from my session will be included there as well. The other great resource that I want to point out is the Technical Source guide ONLINE! I encourage you to submit your cool projects to the site. It doesn't need to be ground-breaking - there are alot of cool processes out their that we assume is common knowledge that really isn't written down anywhere, and that really is common knowledge when you have worked with X person in X shop.... Plus there are often variations on a theme. For instance, Eric Hart on his Props blog, talks about a process using glue and joint compound to create a skim coat for coating wiggle wood. This mixture seems to be one of many that I have heard over the years, some with additions for other textures, and uses. It would be interesting to me to have some place where everyone can right in their recipes, and what they are good for (much like I have seen lists of blood recipes online).
The education commission has resources available for Creative projects for teaching technical production.
The Costume Commission has an active page here.
The Engineering Commission has information about codes, standards, dmx and ETCP certifications.
The health and Safety Commission has a variety of resources available.
The Lighting commission has information about the recommended practice for lighting design graphics here.
There are also sound, management and other commissions as well - so visit USITT to check them all out. And don't forget to submit an article to the Technical Source Guide ONLINE!