I should also say that even though I got the ball rolling on the OSRIC project, I'm not particularly invested in it. I don't play straight AD&D, I play a hybrid mishmash that takes elements from 2e and even things I liked from 3e. My real goal right now is to focus gamers from all the editions on the fact that the core of fantasy gaming is not a matter of rules. Rules are at the periphery - imagery, creativity, and interesting tactical situations are the true heart of all the editions.
Necromancer Games is one of my three favorite 3e publishers along with XRP and Goodman Games. I own the first Rappan Athuk module, 2 Tome of Horror books, Necropolis, and probably other NG products I don't recall at the moment. What NG does is to write modules that challenge player skill rather than merely the numbers on the character sheet. In other words, for example, you need to interact with the situation before you get a search check (or you get a bonus for actually doing the right thing, at the very least). That's what distinguishes the products of these publishers from d20 drek that bypasses player skill to only challenge the numbers on the character sheet.
The result is material that's usable in other editions, because NG takes the time to focus on the imagery, creativity, and interesting tactical situations. The numbers and stats are useless for other editions, but the meat of the module is still there; you can buy the author's creativity no matter what edition you play. The relative value is less than it is for a 3e player, but there's still value.
So, quite the opposite of what Valiant's saying, I think NG is doing great stuff. It's got "flaws" for the 1e community because it's for a different rule set (and mainly my problem with this is the necessary word-count for 3e stat blocks), but the core of fantasy is still there, and that core is high quality.
We all need to focus on the creative core of fantasy gaming that's the same for all the editions, not on the peripheral matter of the specific rules.