In design, the device seems to borrow quite a bit from T-Mobile’s Sidekick, and its touchscreen GUI owes a thing or two to Apple’s (AAPL) iPhone. Which makes perfect sense, since that’s the device it’s clearly intended to compete with. The G1 will run on both 3G and Wi-Fi and be tethered to the T-Mobile (DT) network. It will come preloaded with a version of Amazon’s MP3 store and Android Market, an application store similar to Apple’s App Store. And it will support and sync with the broad spectrum of Google (GOOG) apps–Google Talk, Google Calendar, etc. Its browser is something the dev team refers to as Chrome-Lite, a mobile version of Google’s new Webkit-based Chrome browser.

Oddly, the G1 has no built-in video player. Odder still, it has just 1GB of memory. T-Mobile has helpfully outfitted it with a 1GB/month bandwidth cap, though.

The G1 supports PDFs and Microsoft Office documents as well. Email will be handled through Gmail; there is no Exchange support, though presumably, engineers developing for Android Market will fill that void in short order.

Oh, the device offers copy-and-paste functionality. Hear that Apple?

It will arrive at market Oct. 22. Price: a highly-subsidized $179.

This morning the company announced slotMusic, a compact memory card-based music format that can be played on cellphones, PCs and some MP3 players. It relies on MP3s without digital rights management schemes and is backed by Universal Music Group, Sony BMG Music Entertainment, Warner Music Group and EMI Group, all of which apparently believe that more physical media is the best way to reinvent their business model in the era of digital distribution. Though as SanDisk VP Daniel Schreiber notes, they do have their reasons. “There’s a billion phones out there and a lot of them can play music and a lot of them have a microSD slot,” he explained. “We think there’s still a need for a tangible, physical product. People will appreciate walking out of the store playing music on their phones.”

Perhaps. But will they appreciate carrying that music around on a 0.6″ x 0.4″ medium that’s about the size of a fingernail? Seems easy to lose, doesn’t it (maybe Case Logic is planning a slotMusic binder)? And wouldn’t they rather carry around hundreds of songs, instead of the dozen or so stored on each slotMusic card? And what if the memory card in their phone is already in use, filled up with contacts, applications and other data? What then? And beyond this, haven’t iTunes and Amazon MP3 made consumers more accustomed to purchasing music à la carte? Why purchase a full album at $15, when all you really want are the only two good songs on it?