Dreamscene is and will only be for Vista Ultimate. The OS has technology available that makes running animated wallpapers less resource and hardware intensive. There are supposedly some programs that will accomplish something similar on XP, but with all the resources they use you'd only be able to stare at the desktop and not really get anything else done.

Currently, nobody is really working on it that I'm aware of, and it would have to be done completely differently than it's done on Vista. With Vista, the desktop surface can be accessed and rendered directly onto, but on XP, this isn't the case. If you want to simulate it, you can try the VLC player, and set it to play on the background. This would be about as close to animated backgrounds on XP as I've heard people doing. I would not expect Stardock to be putting any effort into this, as it would be a new engine, not the existing one, and it would take away from development of other Stardock features on the roadmap for Vista.

I'll be bold enough and say 'Yes, you are wrong'
I have XP and Vista installed on the same machine and the performance is way better in Vista compared to XP.

sViz has made some DX themes that simulate an animated wallpaper effect. You might want to take a look at them.
Of course you would need to have DesktopX installed.

Tropic Falls WWW Link
Summer's Night WWW Link

It's been proven that all versions of Windows Vista are capable of animated desktops, the underlying OS is the same between all versions of Vista. Microsoft is not offering this feature to anyone but Ultimate users because that's the level of the OS they decided this feature was available for. It's not s scam, it's a pricing model. Each higher version of Vista comes with more bells and whistles. There have already been threads on here with people asking about getting DreamScene and DeskScape to run on other versions of Vista. DreamScene and DeskScape are written for Vista Ultimate only, and please don't waste any of our time asking how to circumvent it on this board, you'll at best get pointed off the boards. Save yourself the time and go straight to google, not here.

what a ds ?

Yeah, I have too, and I can't help but giggle heartily under my breath when presumably knowledgable people try to convince me that Vista is slower, more resource intensive and unstable than XP.

I've been running them side by side on my machine for the last 6 months, and I rarely go back into XP. If and when I do, it's only to do some sound recording/editing as my current soundcard isn't fully supported in Vista as yet. Other than that, I'm in Vista for the lion's share and, with Stardock's TweakVista program to reduce the amount of UAC popups, find it to be quite a bit faster, more stable and reliable, easier to use.

You can run animated wallpapers on XP with out having to install any programs. Try to download the "mayhill_trofish or tiger animated wallpapers" from http://www.mayhill.co.kr/. They have many nice animated wallpapers.