Got good news this week: I'm being promoted to Desktop Support from my helpdesk position. No more phones!

It will be a pretty large increase in pay and responsibility. I am really nervous, though, as I feel I don't know nearly enough about imaging, printers or generally harder windows troubleshooting problems.
Are there any resources that I should brush up on to prepare for a position like this? I had studied for the 70-685/686 but never took the tests. I just feel like I should know more net commands and other things like that which are important. Any current or former desktop guys want to give me some tips/tricks or advice on things that can really help me out in day to day tasks? Should I learn a scripting language?
Thanks guys!