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BTW, there is an obvious extension of MrTom's recommendation not to avoid up or down-rez'ing, if at all possible:

One of the worst things one can do with respect to loss of detail when printing an image is to execute several up and/or down-rez operations on the same image.

This often happens inadvertently.  For example, one might decide to double the dpi by resampling, and you think the new size fits the page, but then, when you send the data to your page layout program, that software modifies the dpi yet again to take into account gutters, margins, bleed areas, etc.  Then, if you are really unlucky, when your page layout program sends this new data to your printer, it may go through the manufacturer's printer driver software which decides on it's own that it needs a slightly different sized non-printable area, and changes the dpi once again by resampling.

Tom