UPDATE: Kiteman points out in the comments that easier to use navigation as described below is available if you first do a search and then click the Graphical Search link on the search results page.
I hereby modify my suggestion to "Make graphical search the default, or adopt the graphical search navigation for the default search results."

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When I search the site and get multiple pages of hits, the only navigation option is a row of small linked numbers at the bottom of the page, like so:
1  2  3  4  5  6  7  8  9  10
It takes an unnecessary amount of dexterity to navigate to the next number and click it to move to the next page of results.
Two suggestions:
1) Increase the font size of the linked numbers so they provide a bigger target area for my mouse pointer.
2) Add a "Previous" link to the left of the 1 and a "Next" link to the right of the 10, to provide big, juicy targets for the most common navigation needs.