GlovePod, recently added to Cydia, allows you to control your iPhone or iPod music control with your Volume Buttons and your Power button while your iDevice is locked. This makes it incredibly easy to change songs with Gloves on, and the way the buttons are situated means you wont accidentally change the song with this App installed.
Pressing the Volume Down button will go to the previous track and pressing the Volume Up Button will go to the next track. By holding down the power button shortly, you can pause and play your music. This is pretty handy. Reminds me of the functionality that SnapTap brought us.
Check it out in Cydia now.
More info here:
http://modmyi.com/forums/iphone-news/695482-glovepod-control-your-iphone-ipod-using-volume-power-buttons.html