Only voted for two this time.
Y'know, I read "Revelation Space" just a couple of weeks ago. I quite liked it but, man, it was long. Well realised and some great concepts but in the end I was like, "come on, come on, get on with it!" I guess I'm not that into EPIC EPIC sci-fi or something.
Dune -- hands-down classic. Just awesome.
Haldeman -- one of my fave authors. I like a lot of the "other" ones he's done such as "The Long Habit of Living" (AKA "Buying Time") which is a fabulous examination of medical immortality, and "Tool of the Trade" which is kind of a fun easy-read mind-control gadget story. People always associate him with "The Forever War" (obviously) but he's done a lot more stuff than that. "Forever Peace" was pretty good too -- in no way a sequel to "The Forever War" however. Well, maybe thematically.
There's a couple I remember reading that didn't leave an impression. For example, I've slogged through "Stranger" at least twice but I think I mostly don't get Heinlein. I know I've read "Burning Chrome" too but can remember little about it.
As for the novel/short story argument -- doesn't bother me. Basically, Ocicat sets 'em up, I vote and blather on. That's what I'm here for.
EDIT: CRAP!!! I meant to vote for "Eon" as well!! That definitiely left an impression. Brain-bending concepts! Which makes me wonder why the Reynolds book didn't impress so much...
Can I add to my vote?