Sysprep is built into the OS, if you do a fresh win7 install, at the welcome screen before you create any users you can do a cntrl+shift+f3 and access audit mode, do your updates then when done, click the generalize/shutdown options and on next startup it will load back up to the welcome screen, this is of course a good time to use imagex to capture it as well.
ImageX, DISM and the SIM (system image manager) are part of the windows 7 automated installation kit (AIK) which is free from MS. Imagex allows for .wim file image capture, SIM allows for creating unattended installation scripts, DISM is used at command line to update offline images. Also let's you create a WinPE preboot environment to work from and the USMT (user state migration tool) but the USMT is more for business use to migrate user data, the win7 easy transfer definitely works better for customer use imo.
Heres a link to some Win 7 WAIK info:
http://technet.microsoft.com/en-us/library/dd349343%28WS.10%29.aspx
Here is the download for WAIK:
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=5753
When these tools first came out there was some documentation issues, syntax errors etc, here is a link to some updated documentation:
http://www.microsoft.com/download/en/details.aspx?id=2458
When you install the WAIK in start/all programs/Microsoft Windows AIK there is a documentation folder that includes a pretty good step-by-step basic win 7 deployment for IT, I would suggest following that pretty much step by step if you want to learn more about these tools. If you don't know a ton about win7 too might be worth just picking up a MCTS:win 7 configuring certification book, think mine was like 35 and it's definitely worth it even if you don't go for the certification itself, I read:
http://www.amazon.com/MCTS-70-680-Cert-Guide-Configuring/dp/0789747073/ref=sr_1_1?ie=UTF8&qid=1314601205&sr=8-1
An even cheaper option that covers the material in a little bit less detail but is free and in youtube video form, check out: http://www.professormesser.com/microsoft-70-680/free-microsoft-70-680-training/
This guy has videos on A+, Net+, he's been working on the updated Security+ videos lately and the 70-680 the windows 7 exam videos. Best free videos for the basic IT areas I have seen and I found them to be a HUGE help.