I finished writing a driver for the Zephyr2 on the iPhone. It's the same multi-touch solution that Apple has used starting from the first generation iPod touch and up to and including the iPad.
Now, of course this shouldn't be construed as a promise to support the iPad eventually, but this multi-touch driver is definitely a concrete milestone that is important for pretty much all of Apple's mobile Internet devices.
More immediately, this is pretty much the sole remaining blocking issue on the first-gen iPod touch and one of the two major issues on the iPhone 3G. The other issue on the iPhone 3G is baseband SPI. I'm wondering if we can get away with just using the debug uart to make calls (if we don't care about having a fast 3G data connection yet).
Also, I'd like some opinions from this blog's readers: More frequent updates? Or just document the major advances?