Photoshop resizing & printing

2 questions;

First, I have some pixel art I want to resize to a much larger (printable) size in photoshop, but photoshop likes to automatically blur sharp edges... is there a way to turn that off so I can resize the pixel art and retain the sharp, pixelated look?

Second, I want to print this like poster size. I plan on going to kinkos or something to print it. What do I need to know about setting up the file? Ex: what's a good resolution (I hear 300 dpi), do I need to make the file CMYK instead of RGB? What format is best for printing and getting it to look as close as possible to the way it does on screen? Any other tips? Thanks.

>>11
You really are a clueless twat, aren't you? RGB is used for displays (on Macs, PCs, TVs, and just about anything else with a colour screen), CMYK is used for print (Ever used a colour printer? What four colours do you always find in them, be it toner, ink or film?). CMYK has nothing whatsoever to do with Macs or PCs (nor does RGB either; in fact they both pre-date computers). RGB and CMYK are just different colour models. If you're planning to take something from screen to print, you have to be aware of both, and know how colours in one will appear in another. What, do you think Macs have CMYK displays or something?