Danger has announced that it will ship a beta version of its SDK to developers in one week. This has been long-promised, and would allow hackers to roll their own tools and apps for the T-Mobile SideKick (and other HipTop devices as they are licensed) — I'm hoping that we get the kind of cambrian explosion of software for these devices that vaulted the PalmPilot to success over the Newton.
(Thanks, David!)