You can turn your taskbar into an OS X-like dock by simply making the Quick Launch icons bigger:
1. Right click the taskbar and make sure that "Lock Taskbar" is not checked.
2. Enable the Quick Launch bar
3. Drag the Quick Launch bar onto the desktop
4. Right click inside the Quick Launch window and choose View>Large Icons
5. Drag the Quick Launch bar back into the taskbar
6. Voila! Put this together with certain Visual Styles and icon sets for some interesting effects.