The Nokia Blog have received this statement from Nokia:

The Nokia N900 is used as development hardware for platform developers working with MeeGo on ARM hardware architecture. While the software from the MeeGo project runs on the Nokia N900 for development purposes, Nokia does not intend to provide a dual-boot OS option to consumers in upcoming N900 commercial software releases as we want to ensure that we provide the best possible experience designed for that device. The meego.com blog post was primarily targeted to the audience reading the blog: MeeGo developers.

Hmmmm... oh well... we'll just have to do it the difficult way then.