To be honest I think that the rush will be as follows: (and is already on)
DoubleKeyword.com's
Major DoubleKeyword.net's and .org's (mainly fuelled by godaddy's net/org price hike + the fact a good name, is a good name)
Foreign Keyword IDN .com's
The last of the generic keyword .tv's and .us's
the last of the .de/.ru/.pl/.eu/.co.uk/.it domains
then primary and double keyword ccTlds
what else is worth buying? this current trend of domainers domains like quad premium 4L's has to stop soon; they just get passed from domainer to domainer and really have no use.. your a big astronomy society, would you rather have tasl.com or AstronomySociety.com
I fear I'm ranting and going ot
note: tried googling site:.tld/ recentely to get domain index stats? [eg: site:.com/] ?