I don't know if there's a free list online with the current top 25 rankings for each breed, but looks like you can buy the list at the AKC store.
http://www.akc.org/store/reports/index.cfm?report_category_cde=TOPDOGS&product_view=thumb
You can get a free list from AKC with top 25 ending Dec. 06.
http://www.akc.org/invitational/top25/top_25.cfm?in_show_year=2006_dec