The T-mobile G1 is a day old and already we will be seeing the first firmware update as early as today for some users. According to the T-mobile forums the G1 will be receiving the update between 10/23 and 10/25 if you participated in the pre-sale, otherwise by 10/31.  The OTA update includes enhancements and one bug fix that makes all Amazon songs available for listening.  Details are a bit sketchy at the moment, but we are sure we’ll have the full breakdown after our G1 is updated.

• What does this update do?  This update will include enhancements (I don’t know what is termed an “enhancement” and one bug fix that is visible to customers which makes all songs from Amazon available for listening
• Why do I need it? So your device will perform better long term and you don’t have to worry about corrupt files from Amazon. 
• When will I get mine? If you participated in the PreSale, you will receive it between the 23rd-25th otherwise you should get it by 10/31.  For those receiving their devices after that date you should receive the update soon after you activate the phone (within 2 – 3 days).  New phones from HTC will come pre-loaded with the update.
• What if I don’t get mine? Just wait for it, it will come.
• What do I do when I haven’t gotten mine by the time you said I’d get mine? Wait a little longer
• Seriously, I didn’t get mine.  Where is it and when will I get it? Why am I missing out?  Check your software version, you probably had the new software all along and were waiting for nothing.
• How do I check my software version? From the main screen hit Menu > Settings > About phone > Build number.  Look for where it says RC##  The initial release is RC19.  The Updated release is RC28
• Will I lose any applications or settings?  Nope.  Your settings and apps should be preserved.