After a few days toying around with beta4 I have to say that calling it 'experimental' is an understatement, granted, having a 2. kernel is great, but almost nothing works the way it should,from wireless to cf/sd hotswapping - I even got segfaults while mounting & unmounting filesystems. Totally unusable.
I'm torn between beta3 and OZ 3.5.4.1 now...