Cannondale have the Blues in the 2005 ...
Just noticed that Cannondale have released the specs for their 2005 model of tandem. (Or is this already old news?? If so then please accept my apologies). Here is the link for those interested;
Cannondale Got the Blues
On the face of it - it looks pretty similar (if not the same) as their 2004 model??
Only difference I can see beside the frame colors is a different model number for the SRAM cassette:
'04 = SRAM PG-950, 11-34
'05 = SRAM PG-970, 11-34