It’s been an odd journey these last few months, but Lijit just hit 1 billion monthly page views in the last week or so.
http://www.readwriteweb.com/archives/custom_search_startup_hits_1_billion_monthly_pagev.php
What get’s me though is that the page views value is probably substantially lower then the actual count of handled http requests a month. Wish I had the time to compute that number.