If you're going to do video editing on it, I would actually load up Mac OS 9.2.2 and install Final Cut 2.0 or 3.0, you likely won't be disappointed by FCP2/3's capability to capture DV footage and work with it fairly easily, even on the stock hdd in there. (although you may want to capture onto, and use an external drive when you're editing, as ten gigs will quickly become very very small when working with DV.)

Other than that, congratulations on the mobile computer!