http://webscripts.softpedia.com/scriptDownload/Multi-Level-Login-VB-Application--Download-39374.html
http://www.programmingforums.org/thread18416.html
http://www.trap17.com/forums/Simple-Login-Visual-Basic-6-t23229.html

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Di Youtube banyak banget nih contoh bikin form login 
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http://www.youtube.com/watch?v=LF805TtKFa4
http://www.youtube.com/watch?v=3RbjsSClor4&feature=related
http://www.youtube.com/watch?v=kyhIu2LwV3Q&feature=related
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http://en.allexperts.com/q/Visual-Basic-1048/multi-user-apps.htm