If you liked XP, Windows 7 offers many XP interface options. It also allows you to pick and choose from several individual options. For example, if you liked the XP taskbar, you can quickly adjust the Windows 7 taskbar to give it that XP appearance.
Just right click on an open space of the taskbar and select Properties.
In the Taskbar and Start Menu Properties window, click the Taskbar tab.
Check the Use small icons box.
Click on the button, next to Taskbar buttons:, and select Never combine.
Click OK or Apply, and your taskbar will become the more familiar looking XP version. As an added benefit, it retains one of the nicer Windows 7 features. If you hover your cursor over the buttons, they will show thumbnail images of open applications, rather than just the names that XP offered.
The best of both worlds.