I've found out that the Nurburgring Nordschleife 2009 calendar is announced early 2009.
As a rough guide, this year the track was open all day to the public on most weekends (event dependant) during the summer, whereas monday to fridays were half a day.
2008 Calendar - opens in Excel:
http://homepage.ntlworld.com/nigel.pind" onclick="window.open(this.href);return false; ... r%20uk.xls
(Thanks to Northloop for info)
I'll start a poll as to when the people that expressed an interest in going would like to go. (Remembering things such as summer holiday ferry costs etc.) Then when we actually know what the calendar is, we can tweak it accordingly.