and wth does Vector Craphics have to do with this... to the person who responded above me...
Gimp doesn't even have a tool to
draw a circle, as such ... you make
a circular selection, and ... but you
know that, anyway.
Fireworks, like CorelDraw, MS Paint
and many others will let you draw a
vector based circle out of the box,
and even though objorkum didn't mention
how he made his circles, I'm certain
that this is what he was doing.