5 FREE sidebars similar Vista for your XP!

   1/ Thoosje Sidebar:

Size 8 MB:

Fint more gadgets here (Only for Vista Sidebar)
Skin: here.

   2/ Rainmeter sidebar:

Skin for Raineter Here
Download and copy them to Rainmeter\Skins\ 

3. Google SideBar:

Size: 1.75 MB, Download here, you need internet connection to install.
Download gadget for Google Side bar here 
4/ Vista Rainbar:

Size: 6.92 MB, Download here

3/ Spyderbar:

1.7 MB Download Here