MAC users.. how to assign screenshots to a folder?

How do I assign screenshots to go to a folder automatically without dragging them from the desktop? Also, is there any way to assign my command+shit+4 to screenshot a certain area of my screen without me having to drag every single time?

 

Here's a guide explaining on how save screenshots to a specified folder. http://www.trickyways.com/2009/09/how-to-set-a-folder-to-save-screen-shots-on-mac/

For the other thing, I have no idea. Sorry.

 

You can also use the free downloadable application called Jing. Once you open it it shows up as a small quarter-circle in the top right corner, and with two clicks you can take a screenshot of any window or selection.

http://www.techsmith.com/jing.html?gclid=CJqf0uLi1awCFW_DtgodZm4Upg