I'd love to create a simple application like the gnome art manager with n900wallpapers.com as backend for Maemo5. It could cover the [browse->choose->download->set] workflow, also for wallpaper packs.

@Code177: What do you think about it?
Do you mind to add a script to the site that simply dumps plain xml of the theme metadata so my app can wget and parse it??

@others: your opinions are welcome!