The checkerboard image has nothing to do with the resolution of the map, that all depends on the image you atibute to the map afterwards.
The tweaking of the points has the purpose of getting a better texture flow on your model, without deformations or overlappings. The checkers are to test your UV map and see if there are any unwanted deformations or weird texture "flow" on your model. The regular patern of the checkers helps you identify these problems easier than a "normal", chaotic image.
Check out the first lessons of the caveman texturing tutorial to get a clue about what I'm talking about...
Cheers! :beer:
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" ...'till the world burned!"
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