Both of the generic Penabled pens described in this post work fine with the Edge:
http://www.entourageedge.com/forums/...p=292#poststop
The stylus ends work the same for both pens and the standard Edge stylus. One of the alternative pens has the eraser button on the end. The eraser is an extra input in the Penabled spec, but many devices don't bother to use it in software. The edge software also currently does not support it. So, if there will never be an enhancement, then it is better to save yourself the $8 difference between the pen with eraser and pen without eraser.