To get things started here is Time Magazine's Top 50 inventions of 2009:

http://www.time.com/time/specials/packages/completelist/0,29569,1934027,00.html

Some Highlights:

An AIDS vaccine

Vertical Farming

The Bladeless Fan

Spiderweb Silk

Some other "best of" topics to discuss:

Best Album of the Decade/Year

Best Movie of the Decade/Year

Best Video Game of the Decade/Year (I got my hands on my brother's PS3 and I really like Bioshock)

Best Sports Highlight of the Year

Best Game (Blazer or other) of the Year

Best Blazers Edge post (main page, sidebar)

or Make up your own!