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It has always been 3, however "# Up to three ad units may be displayed on each page.
# A maximum of two Google AdSense for search boxes may be placed on a page.
# Up to three link units may also be placed on each page.
# Up to three referral units may be displayed on a page, in addition to the ad units, search boxes, and link units specified above.
# AdSense for search results pages may show only a single ad link unit in addition to the ads Google serves with the search results. No other ads may be displayed on your search results page. "
So basically it's 3 ad units, but you can add referral ads and link units on the same page which brings it above the standard 3 units.
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