I suspect Azanor would keep his Thaumcraft beta distros to people who aren't likely to redistribute on open forums, unfortunately. Besides, Thaumcraft releases (before version D) are usually as buggy as many other mods' betas (only to be expected with such a complex mod).
Also, what about 1.7 minetweaker and galacticraft?
Thaumcraft beta is given to those that donate on his patron/paetron or whatever it's called I think.
Also, couldn't greg just ask chickenbones around when he's going to release NEI? Modder to modder?