Mac OS X only: We love dressing up our desktops with multi-monitor wallpapers, but if you're a Mac user, getting one image to span multiple desktops is a pain. Free application MultiScape makes it easy.
Lifehacker reader and MultiScape developer David Zwerdling writes:
MultiScape is a Mac application that scales, crops, saves and applies a single image to multiple desktops—a simple thing that can take lots of time by hand. What's best about MultiScape is that it's really simple. All you have to do is supply it with an image. It retrieves the desktop layout information from the Mac OS and goes from there. The process takes seconds.
Windows users have been able to use previously mentioned DisplayFusion to tackle this task (and more) for quite some time, but if you've ever run into this wall trying to set a good panoramic pic to your OS X desktop, MultiScape is potentially a godsend. The app still needs a good multi-monitor wallpaper to start from, and I noticed a bug or two (not all wallpapers turned out how I would have expected), but it's worth a go for easing your multi-monitor wallpaper woes (and hopefully it'll only get better).
MultiScape [Google Code]