Everything (so far!)
I have even just got it working as a NAS Box! With my MyBook USB 500 GB Hard Disk Formatted as a FAT32 I've got it to work as a Windows Share.
The only thing I did was to change to the latest Firmware wr1043nv1_en_3_12_2_up(100820).bin
I had to set it up through the web browser (http://192.168.1.1/) very much like my old D-Link.
Appears to use Linux as its operating system judging by the licensing.
Setting up the NTP Server is a problem to me as it requires an actual IP address, not something like ntp2.npl.co.uk which is the normal.
I use 126.96.36.199 and 188.8.131.52