Chuck, every single album Radiohead has released has been completely different from the last. If you want, I'll elaborate:
Pablo Honey -- complete pop-rock
The Bends -- pop-rock with a tinge of weird darkness ("Street Spirit [Fade Out]" being the preeminent example)
OK Computer -- post-pop, redefined rock, maintaining pop structures while innovating on them
Kid A -- weird, less poppy, more progressive instrumentation, some atmospheric stuff
Amnesiac -- same basic premise as Kid A (the songs were culled from the Kid A studio time) but more poppy at times
Hail to the Thief -- for the most part, a return to the OK Computer style of post-pop, but maintaining some of the more electric influences of Kid A (on "The Gloaming" and "Backdrifts" to name a few)
Radiohead showed more progression from OK Computer to Kid A (or even in the span of "Paranoid Android") than most bands do in their entire careers.
