Bootskins are only for XP, They don't have a Bootskin program for Vista or 7.
If you click on Explore (near the top between Home and Articles), you get a page where you can choose to view the different skin categories. Logon Studio XP would be logons for XP (obviously), wheras Logon Studio would be for (as it says) Vista and 7.
I think depending on if you are a Wincustomize subscriber (as I am), Under Explore Filters, there is a selection for XP Ready on the Windowblinds page. Window blinds generally say in their description what OS they work on and most of them (but probably not all) will work for XP.
Deskscapes is a tricky one. That would generally depend on the video type and your graphics cards ability. Dynamic and Hybrid should work fine on XP.
Everything else should work with any OS.
