Scroll down until you see Google Instant. Disable Google instant and you can reset your number of results. Oh I know some of you tricky devils are thinking you can then turn back on Google instant. You can, and your setting will stick, but it won't be honored. You'll just be back to the default 10 results per page.
I like the instant results (mostly for the wow factor) but I'd really rather have more results on a page, wouldn't you?