Very useful WSS3.0/MOSS07 Central Admin tool. Through this, we divided MOSS content database from single huge db to multiple small dbs improving performance and management. (Note: while copying sites over to new DB, the sites becomes unavailable). It provides several other essential options.
http://www.microsoft.com/downloadS/details.aspx?familyid=263CD480-F6EB-4FA3-9F2E-2D47618505F2&displaylang=en
Install it and open central admin. Go to Application Management and you'll notice a new category: Batch Site Manager Move, Lock and Delete Multiple Site Collections
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