[gentschev]

Yes and no. Pretty basic spelling correction is pretty good, and as Google makes its spelling operation more sophisticated, I actually find myself needing to reverse their corrections more often.

Indexing is more complicated. You could argue that 20% of Google's index contains at least 80% of the information people need. The problem, like the old advertising saying, is figuring out which 20%. So if you have a clever way to address content quality and uniqueness, suddenly your crawling and indexing costs plummet.