Source: www.aila.org
AILA members have been receiving reports from multiple officials within USCIS indicating that USCIS HQ recently issued instructions to pull for adjudication every employment-based case that had been pending for more than six months, regardless of whether background checks were cleared. USCIS offices report having worked all of the weekend of June 30, 2007, to comply with these instructions. This was apparently to use up as many visa numbers as possible in order to try to cut off receipt of new filings when most employment-based visa categories came current on 7/1/07.
Note that this information has not been confirmed by USCIS HQ
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