Again, just a brief note, because sometimes it's a good thing to sit back and adjust your sense of perspective. Carl Sagen did that so beautifully in Pale Blue Dot--the only science book that made me cry. The title describes what the Earth looks like from the perspective of Voyager I at the edge of the solar system. We live, in Dr. Sagan's unforgettable words, on "a mote of dust suspended in a sunbeam."
The link below (and down in the links column) will give you some nice, shivery, perspective on the size of our Sun:
Scroll down slowly, so's to get the full effect:))