I think there's some confusion here...
The D7000 was announced in September of 2010, well after the D90.
Don't want to sound like a 'camera snob', just want to get the specs straight for the purpose of discussion. Either camera is definitely an upgrade over the D90.
D7000 has 39 AF points, not 11. Still less than 51, agreed.
D7000 has the new TTL exposure metering that uses 2x the sensors that the D300s used.
D7000 has dual SD slots, D300S has 1 SD, 1 CF
D7000 is slightly lighter than D300s.
D7000 has 6 fps, D300s has 7 fps or 8 with the battery grip and the EN-EL4A battery
D7000 has more WB options
D7000 base ISO is 100, D300s base ISO is 200
D7000 has better low light performance than the D300s
Personally, I'm happy with my D700, which is dang near the same thing as the D300s, just with a FX sensor and only a single CF slot. After checking out the D7000 my Dad bought, I briefly considered selling my D90 and buying a D7000, because I still use my D90 to get a little more 'reach' with my 70-200, but I think I'm more interested in what is coming out in the fall.
And, if I need it, I can always borrow Dad's D7000 I'm sure