having read all the replies, I think i've reached the conclusion that the N9 doesn't offer a compelling enough argument to move from the N900.

Why?
1. cost seems to outweigh the benefits
2. more ram is good, but in all honesty i've not found the N900
that slow
3. NFR... more a gimmick really
4. gorilla glass display....this is good, but a reason to spend a few
100 quid upgrading? no
5. more disk space....N900 + a card gives me more than enough
6. No HW keyboard....this really is the dealbreaker for me.

also i'm not clear on whether the N9 will be able to do all the awesome things the N900 does/has apps for
- rdp
- bittorrents
- ftp client
- mount network drives
all of which i use daily for work etc