So basically I'm a huge fan of these genres. Obviously all the drone doom and whatnot is really where it's at, but I love a great deal of this genre in general. Tim Hecker's probably my favourite ambient guy, I thought Harmony in Ultraviolet was freakin' excellent (Blood Rainbow and Radio Spiricom being two pretty good summaries of what is so damn good about ambient), admittedly his older stuff isn't quite as good but it's all rather solid. Eluvium are up there too, their newest one wasn't quite as mindblowing as Talk Amongst The Trees but sure had it's moments, particularly that rather excellent song Ostinato. There's plenty of excellent bands out there, Stars of The Lid, Aidan Baker, Ancestor, Natural Snow Buildings (<-- their stuff is painfully limited but unbelievably awesome, most blissed out sound EVER), Procyon-X and so on and so forth.
I'm pretty much into the more 'upbeat' side of ambient, I guess, I listen to a bit of Lustmord and some of Stijn Van Cauter's stuff (doom/drone/ambient guy, has like 20 projects, most of which are somewhere between drone doom and ambient), but being a bit of a cheery dude I can't say I'll listen to it often. Another remarkable guy is Alan Lamb, who does these field recordings of telegraph wires resonating. Fantastic stuff, I guess it's kind of natural really that the best drone instrument would be some long telegraph wire. Jonathan Coleclough did a rather excellent remix of one of his "tunes" on Halant/Heat/Beech, and it's some of the best drone I've ever heard, a bit of a patience tester but the overtones, the deep low tones and what not generated in that is truly fantastic. Coleclough in general is an excellent drone guy that more people should check out.
Newayz, ambient and drone is pretty damn good, and seems to be getting better as time goes on. Discuss your favourite bands, recommend bands, talk about how boring you find this genre, and hopefully something coherent will come out this thread.