It was time for a change. 8 years of blue was enough. Maybe after another 8 years I will go back to blue again, who knows
Old logo still remains as my avatar, however, I wanted a new/modern one. The colorful brain is made out of several stripes which work together, fit together and bind a powerful brain - just like the community here. The "Den" inside the brain should make it easier to associate the logo with "BrainDen".
"Forum" link on non-forum pages
I had to cut down a lot of links and introduce the real minumum of primary links - so there are 4 links in the main menu now (actually only 3 on mobile to fit smaller mobile screen). Link to forum is on every page in the footer, and also after every brain teaser (in solution spoiler). There is also a separate page dedicated to the 15 latest puzzles/riddles from the forum - http://brainden.com/new-riddles.htm
Forum is also mentioned in regular text of homepage, best puzzles page, contact page and several other places.
Latest puzzles from forum are feeded into Google Gadgets, twitter and facebook.
Of course, all of you could make this forum more prominent if you would link to it from your school pages, your personal blog, facebook/twitter accounts, other websites you visit etc