OK so here we go:
After the install (which essentially involved downloading a customized ISO which was a slightly modified version of Leopard with the 10.5.6 update included, burning it to a disk/bootable USB stick and installing it as per Leopard) the following issues exist:
1. Screen Brightness is controlled via a Quicksilver 'trigger' for up and down. It makes no difference except you dont get the Apple Brightness screen overlays, you get a slightly ugly image for up and down.
2. After a Sleep, the brightness will reset back to a default value. Sometimes (normally never) the brightness up/down wont work until you reboot.
3. When you plug in headphones the output does not auto switch to them, so you need to toggle a option in the menu bar.
4. The LAN (cat 5) port does not work, and most likely will not ever work. I ordered a £18 Apple USB-LAN adaptor designed for the Macbook Air
5. The internal wifi card does not work. You need to buy a Dell 1490 (a/b/g) or Dell 1505 (a/b/g/n) card. I bought a 1505 from Ebay for £20 (its the same Broadcom card Apple use in the MBP anyway).
6. The internal mic does not work, and a external mic (i think) sort of works. This is probably why Skype crashes when you start a video call.
7. Intel speedstep doesnt seem to work, so it always runs at full CPU speed. Mind you, with full brightness I get 5 hours battery life (I am not kidding) and with half backlight I get about 6:30, maybe 7.
8. It wont sleep when plugged in to a power supply, only when on battery power. No idea why!
Note that for the audio issues (headphone switching, internal mic) a team called 'Voodoo' are working on a driver which will fix it all. By all accounts this is not bogus - they have a semi working solution now. The good news is, the MSI Wind has the same issues so the driver will get made as its not just for the NC-10.
Although above I mentioned that Skype crashes, the text chat works etc. I have not had any software issues at all (apart from Skype). I am currently running, Mail, iTunes, iPhoto 09, Safari and its as snappy as can be. MobileMe syncing all works. I guess I would like to stress that nearly everything does work - i.e. you dont have to worry that a certain app will not install or that a software update will break your laptop (I mean updates to apps - dont install a OSX update directly, wait for the community to try it first).
Phew.... finished!
I am definitely interested.