Wow. There are a ton of bullet items in this patch! The following was posted by Cesar in the Zune.net forums...

  • Fixed top crashing bugs submitted by users
  • Fixed bug where Zune software thinks the device memory is full (but isn’t)

Key Marketplace fixes

  • Allow users to view top music videos in marketplace
  • Misc improved error messaging including splitting sign-in issues into 4 separate errors for customer and support benefit
  • Retrieval of subscription download history no longer stalls if the content is revoked
  • Better handling of accounts that have expired credit cards
  • Podcasts with spaces in their name can now be subscribed to
  • Marketplace no longer blocks explicit content purchases when parental controls are set to allow
  • Points balance label is now updated when user purchases new points

Key Player UI fixes

  • Allow zooming in/out (2x, 4x, fullscreen) during video playback to prevent stretched playback
  • Ability to switch Zune to GDI mode through command-line parameter

Key Podcast fixes

  • Allow subscriptions to podcasts larger than 10MB
  • Fixed some parsing errors that prevented some podcasts from syncing to the device
  • Fixed bug where podcasts were unsubscribing themselves

Key Setup fixes

  • Fixed numerous bugs affecting build to build upgrades
  • Improved installation for users accessing from corporate networks
  • Fixed driver uninstall failures
  • Included device 2.3 firmware in client download
  • Failure in creating system restore point no longer blocks client installation

Key Sync fixes

  • Fixed issues with reverse sync
  • Fixes issues with sync meter UI showing incorrect information as to what is on the device
  • Fixed issues using wireless sync with multiple devices to the same PC
  • Fixed a few different issues setting up wireless sync
  • Device is no longer being reported as full even after deleting large file from device
  • Device content is no longer being turned into guest content when it shouldn’t be
  • Content with bad metadata now shows properly so it can be removed from device
  • Turning off “autolaunch when a Zune device is connected” no longer prevents “Sync Now” from working from a wirelessly connected device
  • Podcast bookmarking is now transferred/saved to the device
  • Wireless sync connection continues to work after rebooting host computer
  • Unsubscribe podcast from device now works properly
  • Changing album art in the client now updates the device as well
  • Duplicate tracks are no longer synced to the device twice

Key Xbox Streaming bug fixes

  • Xbox Streaming now monitors the rip folder if user changes default location
  • No need to reinstall client to fix Xbox Streaming when upgrading from XP to Vista

Key Infrastructure fixes

  • Vista x64 customers can now get to web help from error messages
  • Client no longer crashes if database is corrupted

Key Library fixes

  • Changes in pictures or video metadata made outside client will now get updated in the library
  • UI is now smoother during file groveling
  • When a track is added to an album we will now always update the track on disc
  • User can now update album art for marketplace tracks
  • 'Unknown Artist' metadata is no longer written to files when writing out user edit of album name
  • Renaming  an artist now more reliably keeps the change
  • Two different copies of the same album no longer get duplicated down to one when it shouldn’t
  • Access violation no longer occurs when checking song properties in the burn list
  • Multi-disc albums imported from iTunes no longer show in the client as a single disc album
  • Thumbnails for video content now extract on XP properly

Give us some feedback on the patch when you apply it... Also, check this thread to give input too.