72ppi (pixels per inch) is a 'standard' for monitor resolution. There may be monitors that have more, but I'm not as up on speeds and feeds as I used to be.
Now Dots per inch (dpi) is printing; the standard laserjet can do 300 dpi without breaking a sweat. Some have tricks to get up to 600 or 1200dpi, but it depends on what you're after. If you want photographic quality, you'd want high resolutions, but it's a combination of what your printer will do and what you're aiming at.

If you're interested, there is a Printing forum here, which can go into greater detail.

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)