exactly as sync said...the higher the aperture number the less blur effect you'll get therefore you get more focus.
OR manual focus. because the bigger the f-number the longer exposure and also the less DOF.
I think that's a typo there, Jake. The bigger the f-number the greater the depth of field.
On a wider point, provided the f-number is large enough to achieve the required depth of field then it can be counter-productive to go larger. Image softening due to diffraction will certainly be kicking in at f/11 or larger on cropped sensor DSLRs (some would argue that the figure should actually be f/8) and for compact/bridge cameras the required f-number will often be f/4. Have a look at the article Understanding Diffraction
for why this is so. The article Understanding Depth of Field
should also be useful and it includes a handy DoF calculator
which handily illustrates how DoF is dependant on sensor size, actual (not full-frame equivalent) focal length and distance to the subject as well as f-number.