Not as two separate screens, but you can use something like this to make them appear as one screen...
Thanks, so that will allow me to extend my desktop on to two external monitors right?
Don
Sort of. Your Mac will think that there is one huge screen with the combined resolution of the two screens. So you can't place one screen on each side of your iMac...
Okay, thanks! I'll have to look into that more. One other question, would this work, if one of my monitors is widescreen (19"), and the other is 4:3(17")?
Don
Not as two separate screens, but you can use something like this to make them appear as one screen...
Actually, there is something called DisplayLink.
Computer -> USB box with DisplayLink -> Monitor