I personally liked it best when the Press Release forum was the Industry Discussion forum (or whatever the name was, I'm probably getting it slightly wrong), and it was the home of both press releases and discussion about the business side of RPGs. I liked the separation between game-play in General and game-business in a different place. I think it also kept the traffic in the Press Release / Industry forum higher.
The biggest thing I like about the Press Release forum, though, is that it keeps the other forums free of advertisements. I know that publishers posting about upcoming releases or sales isn't exactly the same ads, but there's a very fine line between posting a promotion and spam. Keeping those type of posts corralled into one location draws a clear line in the sand about where its acceptable and where it isn't.