In fact, Eric Flints page is the main source for new snippets (at least, concerning books of David Weber, Eric Flint or David Drake). Any other ones (like the ones in Baen's Bar or at jiltanith.thefifthimperium.com are only copies from there ...)
Some other authors (John Ringo, forex) are snippeting themselves and publish their works in their own conferences in Baens Bar. But these snippets you'll find also at jiltanith - thanks to Joe Buckley.
