VideoLan – http://www.videolan.org/vlmc/
Free
Not available as yet

Sony Vegas – http://www.sonycreativesoftware.com/vegassoftware
$500 for Pro edition
Very Powerful

Adobe Premier – http://www.adobe.com/products/premiere.html
$19 / month
Powerful
Part of Adobe master collection

LightWorks – http://www.lwks.com/
Free (Pro is $60)