As Jeremy mentioned yesterday when he was speaking in the department of geography at Royal Holloway, mapknitter can take imagery collected using custom methods (such as hot air balloons) and knit it together into one image, with rectification
Geocommons is not all that new but it is useful to keep in mind that it is in its 2.0 incarnation
Fulcrum really looks great, and it works on both iPhone and android platforms. This one is new to me, but it might be making an appearance in GG3090 in the future
In the end it's all about making beautiful maps!