I'll add Benevento/Russo duo. Marco Benevento and Joe Russo. They were active in the early 2000s. They used a lot of technology to push the boundaries of what an organ/drums duo could be. These two don't play much anymore as just a duo but have gone on to bigger projects in the jamband world, including collaborations with members of Grateful Dead and Phish.
Here is a studio version and live version of one of their more popular songs, Sunny's Song. Notice that the drummer has a keyboard, too. In the beginning of the live video, he triggers chords on a sample pad, to free up the Benevento the play other keyboard parts.
[video:youtube]
[video:youtube]