I had heard something a long time ago about homebrew. I know there will be no public hombrew scene ala Dextrose, but what about all those tiny 3rd parties out there. I read one post about some N64 games, Body Harvest I think, and even though Sucker Punch is big now, Sly Cooper, it would be rad to get some Rocket:Robot on Wheels titles or how about Tetrisphere (best soundtrack ever Nolan)?
With the new download service we get to see Bionic Commando again and all those groovy Shadowgates (which better have a Rev. update, the controler would be perfect) and developers and publishers can throw Meteos style projects and small <12MB games, Mario64 was 8MB, into the mix.
Imagine a hub with a list of all the older consoles and then a menu item for current "niche" titles, like the mini games from Smashbrothers/Mario Party/Wario Ware/etc in tandem with the newest offering from Ion Storm Inc, joking. This whole download service has a metric butt-load of potential.
Nolan Bushnell just finished praising the Rev. controller, maybe there will be a downloadable version of his new "Ping" game to play when the honies come over.
On a side note, what is keeping from Nintendo from openning up their entire Gameboy library up to the Revolution download service? I'm wondering if it could be the next installment of the GBA (or whatever they plan on calling it). This could be a testing ground for their next big thing, the Gameboy Virtual Handheld. It would be nice to see everyone all on one box, i.e. playing Capcom's Zelda games on my Rev. and rolling back time for Mario Land on the same box.