The highest resolution supported by the Canon WUX-400 is 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) projector, which is the most frequently found resolution supported by similar spec projectors that have been around for more than two years.
A 1920 x 1200 (WUXGA) graphics resolution is actually the best supported resolution across all 2000:1 contrast ratio multimedia projectors that were released more than two years ago.
Across comparable types of multimedia projector the worst supported resolution is 640 x 480 (VGA).
If you want a multimedia projector with a higher resolution then you might also want to consider the Canon WUX400ST (£2,751.60) (1024 x 768 (XGA)|1400 x 1050 (SXGA+)|1440 x 900 (WXGA+)|1600 x 1200 (UXGA)|1920 x 1200 (WUXGA)|640 x 480 (VGA)|800 x 600 (SVGA)) which also has a higher Rating.