I've reverted the VC CVS coglinux-2.6.22(.6) back to linux-2.6.22 base, and this boots more frequently than the 220.127.116.11 versions!! I'm still getting Magic bitmask issues from JFFS2 and lots of MTD do_erase_oneblock() timeouts :(
I'm going to start applying patches, and see if further kernel versions become more or less stable.
Plus close to deciding whether to blitz WinXP off the laptop and reinstall only Ubuntu on. (As well as testing out all the info on the Wiki to see if all the install and setup steps are correct and nothing is missing)..