I think this is a major miss on the part of Motorola. The Droid should have been engineered to have audio streaming (not mounting of the SD card) via USB.
Real USB doesn't stream analog audio... which seems to be what you're after. The RAZR did a hack, to reuse the USB jack for analog cellular headsets.. but that's of no value for high quality audio, anyway.
The iPhone dock does support an analog audio output, which made some sense back in the early 1990s when that iPod dock was first invented. But this isn't the early 1990s. The DROID does a fine job delivering audio via Bluetooth. And this is far superior.
Ok, first, the iPod... those iPod docks only work with iPods. Buy another kind of player, and you're SOL... they don't work with your dock. They also force the form-factor of the iPod.. they can't make one that's larger or much smaller without killing the dock function.
Now Bluetooth... it's an industry standard. I have a nice Altec Lansing SoundBlade sitting over on my desk, which works just dandy from the DROID. The DROID itself uses far less power hooking to that device than it would to an analog dock (because it's just 1mW Bluetooth). Bluetooth also does the remote control standard, so I can FF/REV via buttons on the Soundblade. And I don't even need to take the DROID out of my pocket. Wired docks are SO 20th Century. And if I get a different phone in a few years, it'll work with all the BT accessories I have today, not need toss it all out if I don't buy a Motorola product.
Not that comparing it to the iPhone is that important but... the plethora of devices that you can hook up to the iPhone with the single connector for both audio playback and charging (and synching and everything else) is a HUGE win.
No, that's a bit fail. I don't want to be locked into a single vendor (like Apple) or even a single PC. There's usually no need to sync a DROID... if you make changes to stuff on the DROID, it just automatically syncs to your web-based things. Ok, it is still new (keep in mind, there was a decade or so of iPod before the iPhone came out). Right now, most of the stuff syncs "to the cloud". But in the long run, there's no reason you couldn't have any and all PCs you want also sync to the cloud, so your local apps would just automagically stay in touch with the DROID (or any other Android device).
As for connections... the DROID hooks up via USB, just as it should. And via an industry standard connector (and one engineered for 10's of thousands of plug/unplug cycles)... why would I want something proprietary. And when it's connected, it's a USB storage device. So it works on any platform that can talk to USB storage devices.. I could even hook it to my Sanyo camcorder and download files. Why would I want the proprietary nonsense you get with the iPod/iPhone?
When I first read that they were going to have a "Multimedia Dock", I fully assumed it would have this feature built in, and that it would either have speakers, or at least a 3.5mm jack built into the dock so that you could just plug the Droid into the dock and hang your speakers off the dock (rather than have to plug a second device into the Droid). I love my Droid, but to me, this is a pretty major fail and will definitely keep the Droid from every being a significant multimedia device, the way the iPhone has become. Just think of all the accessories that might have been possible...
Wired died a long time ago... Apple's just still reacting, poorly. Even if you want PC sync and all, why do you even need to hook it up. You have Wifi on the DROID. Now, sure, Google is all about the net, so media sync via internet may be too slow, but every other kind of sync (contacts, calendar, etc.) is fundamentally superior, because you never NEED to sync.. it just happens.