The Nikon D7000 has received an unnofficial firmware update that allows you to get around the lowly record time limits for video.  The Nikon Hacker team now has lifted the limit to 25-30 minutes for the D3100, D5100 and D7000 cameras.  Note that this is an unofficial update and not sanctioned by Nikon.  use at your own risk.

[Nikon Hacker via Nikon Rumors]