It says it all here:
http://www.home.ntl.com/page/epgpolicy
But the gist of it is that NTL are (finally!) going to renumber their channels into genres in the second half of 2005, although new channel launches will fit in with the new scheme before this (which probably explains ITV3).
They also mention something about coordinating with other DTV providers to give channels the same numbers across platforms: fingers crossed this means they're going to copy Telewest's excellent ordering...
Anyway, it might be a year away, but at least it's progress!