The moment you've been waiting for is almost here... It would've been here, but my host site seems to be undergoing maintenance. Oh well, at least I can offer some info on what I've done.
I've completed four sound packs in full: Chance Vought F4U Corsair, North American P-51 Mustang, Republic P-47 Thunderbolt, and Supermarine Spitfire, all with true-to-life sounds, from guns to engines (though it's really mostly about the engines, isn't it?). All sounds are formatted to sound exactly as they should, so the engines will drown out most of the other sounds, though you'll still be able to hear your flaps and gear deploying. If you listen closely.
Since I can't upload, I might rework my Bf-109 sounds before I upload these... But don't hold your breath. It's arduous work, and it takes a lot of time and patience.
Do keep in mind that these sounds, for the highest level of authenticity possible, are optimised for hardware soundcards on the level of the Audigy 2 (read: lots and lots of frequency pickups). So, if your sound card (or on-board chip) doesn't have a very high signal-to-noise ratio, you might hear some clipping. I'm on AC'97, and they sound fine, though I'm not too sure about any lesser chips.