What's funny is that I used to do this a LOT. If you're not careful, you'll end up with copies of emails from Ebay notifying you something hadn't sold. And unless you do a lot of Ebay selling and those are essentially actionable tasks, you probably don't need a reason to forward those. And I forwarded those... a lot.
|I did that? Oh silly me!|
I would suggest, use this feature sparingly; it might be smarter to just highlight any text you need to make note of in the emails and use the Springpad webclipper to deal with the information accordingly. :P
Have you ever found yourself making more of a mess when trying to get to inbox zero?