Might as well post here again.
First, compability list is wrong about Wetrix + AGAIN! Wetrix was never ported to Dreamcast. The only version of Wetrix was Wetrix +, remove Wetrix from that list. And I can confirm that the full version with CDDA doesn't work.
Ikaruga works, but music synchronization is a bit wrong, invisible bullets in second level. One enemy formation near the end of first level seems wrong...
Skies of Arcadia (Echelon)works fine here, but the music screws up somehow (it still plays, just not like it should, hard to explain, anyone have any solutions for me until I buy a Gamecube and the Gamecube version of the game?)
Don't ask me why, but I have the Japanese version of Dancing Blade, doesn't get past title screen.
Cosmic Smash does indeed work nicely, but it's a boring game.