A new update for Nokia Os 2008 is available for Nokia N810 (and I suppose N800 too).
All you have to do is connect to Internet, refresh package list and install the updates.
The main application that have been updated are Mail client and web browser. Map application has been updated too.
The total size to download is about 19 Mb and for the first time, no re-flash is required to update N810 firmware. At the end of the installation you're only required to restart the device.
N.B: be sure to have at least 19Mb free on the device, else the upgrade will fail.