Mac OSX: Change the keyboard shortcuts for screen capture

I frequently want a screen capture to ad to blogs and documents and dont want tp have to hold down 3 keys to get it. To change your iMac keyboard shortcuts:

System Preferences Keyboard Keyboard Shortcuts Screen Shots Click on shortcut to change. Tap the tab key twice so that the shortcut sequence is editable Tap the shortcut key you want (I choose F15 which is in a similar position to the PrtScr button an a Windows Machine) Try it out !!!
I reassign the following: Save picture of the selected are as a file Save picture of selected area to the clipboard

You may also want to: Change the File format for screen capture