It's still in beta, give it time. Vista has a whole different way that logons work, and it will take time for Stardock to to put more time into LogonStudio Vista.
Right now, all you can do is change the background..so I don't even bother to post any until hopefully there is the ability do do more with them.
I use Vista pretty much full time now..the only reason I dual boot with XP is so I can continue to make logons for XP, but I realize Stardock's other programs are a much higher priority than logons for Vista, so I'll stick with XP logons for now.