Adventure Game Studio allows you to create your own point-and-click adventure games. And it has a strong community, with lots of nice adventure games.
Wintermute is another quality engine for creation of point-and-click adventure games.
Adventure Developers website: articles, tutorials, interviews, reviews, everything an adventure developer needs.
Just Adventure has the latest news, game reviews, articles, walkthroughs and a lot more.
The independent game developers forums.
A great website, with lots of content and very helpful forums.