To answer my own question (I wish I'd been able to copy from the iTunes window :( ):
This update contains many bug fixes and improvements, including the following:
* Enhancements to Maps
-Google Street View
-public transit and walking directions
-display address of dropped pins
-share location via email
* Enhancements to Mail
-resolved isolated issues with Schedule fetching of email
* Improved stability and performance of Safari
* Podcasts are now available for download in iTunes application (over Wi-Fi and cellular network)
* Decrease in call set-up failures and drops
* Improved sound quality of visual voicemail messages
* Pressing the Home button from any Home screen takes you to the first Home screen
* Preference to turn on/off auto-correction in Keyboard Settings
Improved stability and performance of Safari, thank god. My MobileSafari has been crashing at an ever-accelerating rate. I can't even load the Apple store, and you know that that has got to be a priority one bug.
I suppose the removal of Podcaster is now explained by the new ability to download podcasts from iTunes. Podcaster would essentially be killed by now but why didn't they let the developer sell his app for a couple of months? It sounds like it would have been good for everybody.
This update contains many bug fixes and improvements, including the following: * Enhancements to Maps -Google Street View -public transit and walking directions -display address of dropped pins -share location via email * Enhancements to Mail -resolved isolated issues with Schedule fetching of email * Improved stability and performance of Safari * Podcasts are now available for download in iTunes application (over Wi-Fi and cellular network) * Decrease in call set-up failures and drops * Improved sound quality of visual voicemail messages * Pressing the Home button from any Home screen takes you to the first Home screen * Preference to turn on/off auto-correction in Keyboard Settings
...
For information on the security content of this update, please visit this website: http://support.apple.com/kb/HT1222