OS 2007 is fairly mature by now with a decent set of ported applications. OS 2008 is new and only a beta is officially available for the N800. I would wait until the official release. Some of the changes made in OS 2008 should make porting existing Linux desktop aplications to the tablets easier, but as of now there are fewer available aplications. Some of the major applicatins such as Maemo Mapper, Mplayer, etc. but are not necessarily well tuned as few of the applications developers have their N810's yet due to delays in the developer discount program.