Would be pretty cool if someone implemented a decent browser-based MMORPG with a high degree of scriptability. Get the best of MMORPGs and MUDs + portability.
The other day, I was thinking about an SMS based MUD for cheap feature phones - text based of course. An online game for places without much 3G adoption but where there are lots of Nokias, so to speak.
I had an idea for a universal MUD a long while back (probably in junior high school, when I was a huge MUD nerd). A single game world with interfaces for IM, SMS, and the web. No matter where you were or what interfaces you had available, you could continue to be immersed in the world. I got the communication code working well for IM and the web, but never went beyond that; with Twilio, it'd probably be pretty straightforward...
