Like most tricks, I stumbled upon this by accident. If you just want to reply or forward a selected portion of an email in Mail, just drag to highlight the portion of the email and click reply or forward. Comes in handy for those long threads.
Watch the video demo
Submitted by Aaron Sterling via E-Mail:
I have a lot of iCal events that I always want to reference with emails which have addresses and notes about that particular event. So I discovered that in the edit menu of each iCal event, there is a space for a URL. If you just simply drag the email you want from the Mail program over onto that url space, it provides a link to that email. That way, you dont necessarily have to write out all the info in that window. I hope this helps.
