Upload your iTunes Music Library XML file to web application SpotifiTunes, and it generates a page full of links to artists, genres, and albums that point directly to Spotify to help you smooth your transition to the excellent cloud-based desktop music player.
To be honest, SpotifiTunes isn't the migration tool we wished it was, but at least it's a start. Rather than requiring you to go one album at a time through your iTunes library and start saving albums to your Spotify account, for example, you can upload that iTunes XML file, then click through to any of your artist or albums straight to Spotify.
More than anything, an iTunes-playlist-to-Spotify converter is a tool we'd kill for, and while it's not currently available in SpotifiTunes, the developer says:
There's no way, at the moment, to take your iTunes library and make a playlist out of it, but I can promise that as soon as Spotify release an API that allows playlist creation I will be on it.
With any luck, Spotify will get on the API ASAP. In the meantime, SpotifiTunes isn't a bad idea—it's just not the end-all of iTunes-to-Spotify migration. Currently Spotify is not available in Australia, so if you want to get a better idea of what it's all about, check out our first look at Spotify.