Windows Phone app marketplace to be removed from Zune PC software
First, we’re removing the option to shop for Windows Phone apps from the Zune PC software. Second, as part of a larger Marketplace improvement effort, you’ll soon need Windows Phone 7.5 installed on your phone to buy and download new apps, or update existing ones.
I can't remember the last time I used the Zune software to check out apps, so I won't miss this feature. Might be an issue for those without wifi access on the phone for downloading larger apps.