Main is the news page. Site updates and stuff are here. You default to this page when you first load the page. News Archive is pretty self exclamatory. This is all the news archived since the start of the site in March of '98.
Interviews are interviews with various people in the community.
Help You are here. Links is just that, links to vaious other place on the web. Lots of other CTF resources are listed here. Downloads is the files section of this site. It's pretty small now, and I don't see it expanding greatly anytime soon.