Okay, I've tried some nightlies. None of them that I've tried work on my NC with 1.3
I've tried the one you recommended, 2.03, then I tried 2.10, 2.11 and 2.13
They seem to install okay, then when I try to power up, I get a nice little green CM7 flag, and then - nothing. I have to take the card out to get the NC to boot up.
Luckily I put the new versions on a spare card to try them out first. When I use the generic image, it creates a really small partition, which, if I leave it, creates errors (not enough room for buffers and inflating packages). So I'm using a partition manager to enlarge the partition.
I'm using a spare 4gb card (class 4) to play with.