Jumplist is a great new feature in Windows 7. It can queue up recently used files of that particular application in the list which pops up on application icon in the taskbar aka Super Taskbar. It has specific Jumplist options for few applications like Outlook 2010 and Windows Media Player 12.
WMP12 makes full use of this feature provided by Windows 7, as seen in above screenshot, Jumplist for WMP12 provides:
A: Frequently Played Files in WMP12
B: Task to Resume previous playlist
C: Task to Play all the Music
This comes out handy most of the time and would save a lot of clicks as well.
Further playback options can be configured from the Live preview Windows of WMP12 which gives option to Play/Pause, Next Track, and Previous Track.
"Windows 7 Tips: Windows Media Player 12 Jumplist feature"
Reference : www.WindowsVJ.com