I usually print from my photoshop or Illustrator files, usually I work in 8.5x11 @ 300 dpi (My portfolio I show clients is that size). I convert the images to jpeg for posting on the net and for my web site if it ever gets finished!
The files print fine as a jpeg, but for some reason things get choppy when you look at the jpeg on the monitor, see my Nova's side stripes in the art show, that's a great example. Looks like I don't know how to draw a straight line.
The original Nova file was 15 meg, so I saved it as 10 or 12" wide at 72 dpi for posting. I'll have to play with the anti alias thing but I'm pretty sure it was turned on. I'll check it later when I get home...