Microsoft's new handheld, their answer to the iPod is a wifi enabled portable music player. The details are still sorta sketchy on it, but it sounds pretty solid.
From Engadget:
Microsoft's new portable audio and video player will have a screen that's "bigger than that of the iPod video" (which isn't really saying much) and built-in WiFi so you can not only download content directly to the player (sort of like with the MusicGremlin), but actually participate in an Xbox Live-like social network that will help you connect with other people with similar taste and interests. Whether that's going to be the Live Anywhere service they introduced at E3 we don't yet know. But we do know the tag line they're pitching for the device combined with this new network is "Connected Entertainment."