User accounts can be hidden at the Welcome Screen in Windows XP.
You can also log in to these hidden Accounts from the Welcome Screen.

Direct Download links to Windows 7 have been leaked.One way of installing Windows 7 is by burning the downloaded iso to a DVD.I found a way of installing Windows 7 directly from the hard disk by extracting the contents of the downloaded iso file.So you don’t have to waste a DVD to install Windows 7.You can install it directly from the hard disk by extracting the contents of the downloaded iso file.

Many people like to install and use Vista Transformation pack and other GUI enhancers to improve the their Graphical User Interface.These packs have to be installed manually after installation XP.
However there is a tool which can directly integrate visually enhanced files in to the XP Installation Source.So , when you install XP you will directly be presented the improved and enhanced GUI.Your XP installation screens will also be visually enhanced.