Custom Login Background Image
One of the things we produce here at OZ is demos, training materials, and Hands-on-labs. Our new weapon is choice is Virtual PC (VPC), which allows us to use a clean operating system image running within our existing one. When someone runs a VPC, the have to log in like any other operating system.
Of course they need the user ID and the password to do so. Instead of making them look in up in a readme.txt somewhere, we simply place the info right on the background image of the desktop for the ultimate in convenience, allowing people to see the credentials as they log in.

(REMEMBER this is not for systems that need to be secured :-o)
People always wonder how we do this like it is some magic; it?s not of course, just a .bmp image that we customize in MS Paint and then a registry key that points to the file. You can point to your own custom bitmap background for logging by setting the following key:
HKEY_USERS\.DEFAULT\Control Panel\Desktop
(REMEMBER don?t do this on a production system ? sorry just had to add the disclaimer)