September 28, 2007 - Due to a tremendous increase in the number of applications filed in the last few months, USCIS advises customers that the processing of fee payments and entry of cases into our tracking system is behind schedule. We are providing the answers to those questions which we most frequently receive on this matter.
http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextoid=82b06a9fec745110VgnVCM1000004718190aRCRD