We still have 37 days before Big Brother 7 begins - here are many of the 'records' as I have them from the last 6 seasons.  These records were compiled by me based on my records of the voting/eliminations each season.

Most Days in the house*: 
BBI - 86 Days July 6th - Sept 29th 2000 (Eddie, Josh, Curtis)
BBII - 82 Days July 1st - Sept 20th 2001 (Will, Nicole)
BBIII - 81 Days July 6th - Sept 25th 2002 (Lisa, Danielle)
BBIV - 82 Days July 5th - Sept 24th 2003 (Jun, Allison)
BBV - 82 Days July 2nd - Sept 21st 2004 (Drew, Michael aka "Cowboy")
BBVI - 80 Days July 3rd - Sept 20th 2005 (Maggie, Ivette)
*Some of these HGs did leave the house - for either a few hours or even more than a day (Jun).
 

Most times nominated: 
BBI - Curtis - 5
BBII - Will - 4
BBIII - Amy - 6
BBIV - Allison, Jack, Erica - 3*
BBV - Jennifer, Marvin - 4**
BBVI - Janelle - 5***

*Robert & Jun had 3 too if you count non HoH in final 3 as a nomination
**Diane & Cowboy had 4 too if you count non HoH in final 3 as a nomination
***Janelle was nominated 6 times if you count non HoH in final 3 as a nomination
 

Head of Household: BBI - N/A BBII - Hardy - 3 BBIII - Lisa, Jason, Marcellas - 2 BBIV - Allison, Jee - 2 BBV - Drew - 4 BBVI - Howie, Janelle, Ivette - 2  Power of Veto winners: BBI - N/A BBII - N/A BBIII - Gerry - 2  BBIV - Robert, Allison - 2 BBV - Diane, Adria, Jase - 2 BBVI - James - 4

Ejected from BB House:
BBI - N/A
BBII - Justin - Day 11
BBIII - N/A
BBIV - Scott - Day 8 (Also Shortest Stay in the house)
BBV - N/A
BBVI - N/A

My Big Brother 7 Page - WILL contain information that has not been shown on the TV show yet - so don't go there unless you want to know things in advance.