Some more on the Android phone. It comes with easy access to Google Maps, including Street View, Gmail and Amazon One Click ordering. Users can also access Android Market, to download applications to expand the phones capabilities. A couple of these applications referenced during the press conference were ShopSavvy, which enables users to scan a products barcode with the phones camera in order to return comparative prices from online and nearby local stores. And Ecorio, which enables people to track their carbon footprint.
T-Mobile customers in the US can apparently pre-order the phone here, though at the time of writing, the site is still dedicated to the press conference. The $179 purchase price ties users into a two-year voice and data agreement and the $25 and $35 data pans are just that data only. Users also need to buy a voice plan for the phone. 
Theres a rich HTML email client for syncing e-mail, calendar and contacts from Gmail as well as most other POP3 or IMAP mail services. Theres also Instant Messaging support for Google Talk, AOL, Yahoo! Messenger and Windows Live Messenger in the US. The phone also has a 3-megapixel camera, but no video capabilities.
On the music front, the handset comes pre-loaded with the Amazon MP3 application that gives users easy access to Amazon MP3, Amazon.coms digital music download store with more than 6 million DRM-free MP3 tracks.   
There are dedicated G1 websites for the US here  and for the UK here.