The Optoma DH1009 has a maximum resolution of 1080p (1920x1080). That's over two times the resolution of a WXGA (1280x800) multimedia projector, which is the most frequently found resolution.
A 1080p (1920x1080) native projector resolution is actually the best resolution across all multimedia projectors that have been around for a similar time to the DH1009.
Across comparable types of projector the worst resolution is SVGA (800x600).
Other data projectors that have a resolution of 1080p (1920x1080) currently available that you might also want to consider include the Infocus IN119HD ($457.99) which has a better Rating.