http://www.noiseindustries.com/fxfactorypro/

Zoom Dissolve applies a zoom blur to both clips as it dissolves between them. The effect can be improved with exposure shifts, twirl distortions and colorization effects.

FxFactory powers hundreds of plugins for Final Cut Pro, Motion, Final Cut Express and Adobe After Effects:
http://www.noiseindustries.com/fxfactory/