For my money, the biggest online developments this year were podcasting and vlogs. Anyone can create and distrubute media, globally, for free. Pretty big deal I’d say. iTunes support of podcasting and videoblogging was of course a huge boost to bringing media-casting to the mainstream. Does that qualify as Web 2.0? I don’t think iTunes itself qualifies, but rich services such as Odeo and Mefeedia are innovative and user-driven – tasty Web 2.0 qualities.

Meanwhile…

Top Ten Web 2.0 Moments of 2005
Top 10 Innovative Web 2.0 Applications of 2005
The Best Web 2.0 Software of 2005
Five Reasons Why Web 2.0 Matters
Web 2.0? It doesn’t exist
Web 2.0 Dead?
Is content king?