A great program called "Snipping tool" comes free with W7. At least the version I have, which is Pro 64http://windows.microsoft.com/en-US/wind ... reen-shots
You can email the screenshot directly from the program, copy it, or save it. Even annotate it with diff colors of "ink". AND, you can capture just part of the screen if you like.
I use it constantly in my job, and it's a great time saver compared to the old way of Alt + Printscreen
No cropping required because you can snip any part of a page, large or small.