Nlite is a great tool for this:
http://www.nliteos.com/
If you click 'Support' (on the left) there is a link to a guide and the forum link leads to msfn which also has other slipstreaming/unattended install resources.
Also,
http://ryanvm.msfn.org/updatepack.html
is a great site for os updates/hotfixes ready for integration (using nlite or not).
If you go up a level there are also installers for Adobe Reader, .NET and Java.