From the website:
President Obama ordered earlier this year that in December the White House would -- for the first time in history -- begin posting White House visitor records as provided in our new voluntary disclosure policy. Today we are delivering on that commitment by posting more than 25,000 records created between Sept 16 and Sept 30. The volume is enormous because we are not just answering specific requests for records -- we are disclosing thousands of folks who come and go here daily. We will do this on a monthly basis, with the records for the full month of October being posted in 30 days.