The government has reached the limit on H-1B visas (the "high-tech worker visa") for 2007, which begins 01 October, 2006.
The leed from the official press release reads "U.S. Citizenship and Immigration Services (USCIS) announced [01 June, 2006] that it has received a sufficient number of H-1B petitions to meet the congressionally mandated cap for fiscal year 2007 (FY 2007)."