What's the difference between Adobe Photoshop Elements 7 and CS4?

What are the differences between Elements 7 and CS4?


Are they big differences?


Is it worth paying more?


Also what's the difference between Premiere Elements 7 and CS4?What's the difference between Adobe Photoshop Elements 7 and CS4?
There is a big difference between the two. Elements is used for average computer users who want to make small time edits. Photoshop CS4(which isn't out for the general public til November 7) is used by most graphic artist as well as web design.