Ellis Vener , Mar 06, 2011; 01:28 p.m.
From looking at what is being done it is assuming you will be printing or web publishing at the full dimensions (in inches or cm) at the resolution you are exporting with. So if you cropped in the develop module to 8x10, you'll get all the pixels that fit inside your crop at 300ppi. whether that matches the resolution your printer uses for an 8x10 print is another question
Unless they are going straight to the web without any post processing I export at @ 300ppi and use Photokit Sharpener 2 as an output sharpener once I know the size, , printing process and type of surface at particular version will be reproduced with.