TUAW and iPhone dev extraordinaire Erica Sadun reports that Apple has dropped the svelte-ish 1GB iPhone 2.0 SDK Beta 5 and accompanying firmware:

The fifth beta version of the iPhone SDK is now available. Log in to the iPhone Dev Center and take advantage of all the development resources available to you—a new version of the iPhone SDK, updated documentation, the latest release notes, and more.

No word yet on what secrets deep delving this latest code may reveal, but if past discoveries are any indication, literally anything is possible (except for cut and paste, of course).

Any guesses?