I make them for myself, and since many people here make covers for their CDs they could find them useful too ;o) link
P.S. They were supposed to be on my web page, but sice I don't have time to update it i decided to put them here first ;o)
The idea behind vector graphics is that they are created using mathematics. This means their size can be infinate in theory, limited only by your computer processing power. Each time you make the graphic bigger or smaller, your computer just redoes the maths!
With a JPEG, this is a bitmap style graphic and therefore the data that is seen is all that is there. If the image is resized, it will pixelate!