Since this topic comes up so often in different forums at DVinfo, I thought a list of existing threads might be useful as a "sticky":

http://www.dvinfo.net/conf/showthread.php?t=69364
http://www.dvinfo.net/conf/showthread.php?t=60244
http://www.dvinfo.net/conf/showthread.php?t=58644
http://www.dvinfo.net/conf/showthread.php?t=18431
http://www.dvinfo.net/conf/showthread.php?t=45450
http://www.dvinfo.net/conf/showthread.php?t=5156
http://www.dvinfo.net/conf/showthread.php?t=8525
http://www.dvinfo.net/conf/showthread.php?t=55819
http://www.dvinfo.net/conf/showthread.php?t=38448
http://www.dvinfo.net/conf/showthread.php?t=6866
http://www.dvinfo.net/conf/showthread.php?t=34639
http://www.dvinfo.net/conf/showthread.php?t=61324
http://www.dvinfo.net/conf/showthread.php?p=455098
http://www.dvinfo.net/conf/showthread.php?t=67976
http://www.dvinfo.net/conf/showthread.php?t=71441
http://www.dvinfo.net/conf/showthread.php?p=514226
http://www.dvinfo.net/conf/showthread.php?t=86292
http://www.dvinfo.net/conf/showthread.php?t=90708
http://www.dvinfo.net/conf/showthread.php?t=90611
http://www.dvinfo.net/conf/showthread.php?t=95566
http://www.dvinfo.net/conf/showthread.php?t=97070
http://www.dvinfo.net/conf/showthread.php?t=99431
http://www.dvinfo.net/conf/showthread.php?t=100697
http://www.dvinfo.net/conf/showthread.php?t=106471
http://www.dvinfo.net/conf/showthread.php?t=123142