I have these on UVERSE, YOU ARE NOT MISSING OUT! NO HD CONTENT At all!
I find that hard to believe on the Rainbow channels. Surely at least the new episodes of shows are available in HD...they are all in widescreen. In fact, some shows that were in 4:3 last year before the HD channels launched are in widescreen this season. Also, I've seen some live concerts on Fuse shot in widescreen. And, at the very least, IFC shows some of the same movies Voom did, so they should have access to HD masters. (AMC might not, because they show the censored versions.)
And while I have no doubt E! has very little HD programming, I have actually seen "Available in HD" supers on some promos.
Of course, Cartoon Network has yet to show Venture Brothers in HD even though it was produced that way, but even they have , what, 30 minutes of HD a week? I don't think anyone has NO HD Content. (Though, I have yet to see any on CMT or MTV, but I only spot check.)