I was working in Outlook 2010 today and found something that I must have looked at 10 or 20 times and never really saw it.
How many times do you need to send a screenshot to someone? I've always used Snag It or the built in Windows Snipping Tool and then copied/pasted it into my Outlook window. It's actually right there in the 'Insert' Ribbon.
When you click on the Screenshot Button it shows all of your open windows - or you can just clip part of a screen.