The games I know of that were intended for the Dreamcast were:
Super Monkey Ball
Ecco II: Sentinels of the Universe
Toe Jam and Earl III: Mission to Earth
And games or sequels that were released for other platforms were:
Panzer Dragoon Orta
Crazy Taxi III: High Roller
Jet Set Radio Future
House of the Dead III
Obviously as you can see my recollection and resulting list is far from complete. Are there any articles or evidence out there that indicate which games were intended for the Dreamcast? I remember reading that Jet Set Radio Future was originally planned as Jet Set Radio 2 and was intended for the Dreamcast. That came from the Official Dreamcast Magazine (UK) at the time though who knows how accurate their information was.
So help in building a list? Thanks in advance.