Keith - Didn't we do this once before? There should be a thread somewhere not too long ago.
As for me, I never found many supergroups to be more than the sum of their parts. For some reason, there needs to be a more dominant vision and a singularity of purpose. "Platypus" comes to mind - Tabor, Morgenstein, Sherinian, Myung. Most songs are Ty Tabor related, just happens to have great musicians attached.
Transatlantic is not as appealing to me as they should have - I have their CD's and the're excellent. And don't get me started on Asia....
But fire away, I like reading the combinations.....