They have also added native podcast support. With the current build, you need to transfer the podcasts from your PC via Zune. With Mango, you can search, download, and enjoy podcasts from a dedicated menu within the Marketplace. There is also the option to stream the podcast, instead of downloading it. One very cool addition is how WP7 will manage automatically downloaded podcasts. To save battery, it will only do so (automatically) if you're connected to a power supply. And to conserve data usage, it will use Wi-Fi as the default method for download.
There are a number of other little visual tweaks and reorganizations. Check out the Microsoft link below for the full rundown. Is Windows Phone 7 capturing your interest yet?
source: Microsoft via Electronista