I think Thom Yorke's new solo album "The Eraser" is excellent, though only a few people I've talked to seem to agree, the rest hate it. Probably because they haven't been exposed to underground chillout and IDM like I have. I can see someone disliking it if they're expecting something Radiohead-ish, the whole album is far more electronic than anything Radiohead's ever done.
I'm a Radiohead fan, but it's hard for me to pick out any one album as the best. I'm new to Radiohead, I got their entire discography at once after hearing The Eraser :S and man, it's a lot of music. I, of course, like the more electronic songs, but there are some great rock tunes on an album like "The Bends."