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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.