There are some really good retroclones out, to the point where I'm not really interested in buying any of the new games at present (other than Dresden Files RPG last year, not because of FATE being my favourite thing, but because it's Dresden Files. In an RPG!).
What retroclones have you got/read/played?
I've got:
OSRIC (1e D&D)
Dark Dungeons (BECMI/RC D&D)
in bizarrely cheap hardcopy from lulu and both are awesomesauce. I prefer them to the rulebooks of the editions they are cloning, particularly OSRIC. They're both free as pdfs or apparently at-cost from lulu.
There's also a 2e retroclone from
here, but I never played 2e myself so haven't bothered.
I do play Pathfinder, but I guess that doesn't count as a retroclone.
I also play Castles and Crusades, which isn't a retroclone (although it plays like 1e, only in my opinion better); it's pretty cheap (particularly the basic rules and the standard monster book) and they (Troll Lord Games) deliver very fast. The supporting modules are decent, too.
Now, non-D&D retroclones are harder, because of the lack of the SRD to take all the familiar names from. However, there are two (both from abandoned licensed systems):
4C, which is a retroclone of TSR's old Marvel SuperHeroes. However, interest in that seemed to die given that classicmarvelforever has been offering scans of the original MSH game for years and apparently no one's complained. 4C is available at rpgnow as a free download.
Doublezero is a retroclone of the Victory Games 007 RPG. Can be found via wayback machine
here.
I can't think of many retroclones of currently available games (GORE, from Goblinoid Games via rpgnow, is a CoC retroclone, I believe, however; much of the Lovecraft mythos is in public domain, but I assume you're also getting Runequest/BRP at the same time, as they're basically the same system, but without any Glorantha), so I assume none would appear for Rolemaster while it's still alive. I would think that it's a huge hassle to find new names and presentation for everything, anyhow, without an SRD, although a fair amount of RM is algorithmic/rules (so not copyrightable, we are
told, although I'd be scared of the possible outcomes anyhow if it were me). The fact that some Retroclones seem to die off, anyhow, rather suggests that it's a hell of a lot of work.
What retroclones do you play? What would you like to see?