Have you ever wanted a Windows CD that would install Windows by automatically putting in your name, product key, timezone and regional settings? And have it merged with the latest Service Pack to save time? Followed by silently installing all your favourite applications along with DirectX 9.0c, .Net Framework 1.1 and then all the required hotfixes, updated drivers, registry tweaks, and a readily patched UXTheme.dll without any user interaction whatsoever? Then this guide will show you how you can do just that!
Link courtesy of Steve Harthon: http://unattended.msfn.org/
Also, try this link.
This is the one I used to slipsteam SP2 and more recently SP3 into a boot disk.
i used there guide for my unattended xp install, tho i did run into problems when it came to drivers, everything else is easy, you can also create a dvd to install all those common apps you use so you dont have to worry about it after the os is up n running (acrobat, av, firefox etc)
Anyone know of a good site where I can get a little guide to slipstreaming office install and adobe studio 8 into the xp disk ?
All software is legit I just want to make the install process that bit easier here on site!
have a look at the msfn forums 
BUMP! Windows 7 can be slip-streamed apparently as an upgrade from XP?
http://technet.microsoft.com/en-gb/windows/dd361745.aspx?CR_CC=200012668&WT.mc_id=src-n-gb-ddp-W7-Q2&CR_SCC=200012668
Only had a quick read, but this seems to be for enterprise deployment for the most part. Could it be used for a personal slipstream project?