Not that I know of. They were saying that there were plans for old adventures converted to 3E to be posted on the web, but this hasn't happened yet.
There was talk of a CD ROM archive ala the Dragon Magazine Archive, but from what I gather that's been cancelled and won't happen. I've read that this has to do with the experience with the Dragon Magazine Archive, because WotC didn't have the reprint rights to some of the content in the older Dragons (and so ran into legal troubles), and on top of that the Dragon Archive didn't sell particularly well.
It's a real shame, because the Dragon Magazine Archive is solid gold, and a Dungeon Magazine Archive would be even more valuable than that, IMO....