The PT-LW271 has a maximum resolution of WXGA (1280x800). That's 30% more resolution than a XGA (1024x768) data projector, which is the most frequently found resolution.
This data projector's resolution (WXGA (1280x800)) is actually the best resolution amongst all 4000:1 contrast ratio projectors that have been on the market for a similar time to the PT-LW271.
The worst resolution amongst comparable types of data projector is XGA (1024x768).
It may also be worth considering one of the other projectors that have a resolution of WXGA (1280x800) currently available including the NEC L51W which has a better Rating.