Here's many in your price range or a bit above:

Fuji Absolute 2.0 - Weight, lb./kg. 24.91/11.29 S.O. & 24.83/11.26 S.T.
KHS Flight 250 (2008)
Jamis Coda
Iron Horse Transit 3.0 - carbon fork - 23.5lbs per Amazon
Scott speedster s60 flat bar - 22.9 lbs per Scott
Novara eXpress Bike - 2009 - carbon fork
Giant CRX (pre-2009)
Giant FSR 2009
Giant Seek
Giant Rapid 3.0 (2009)
GT Legalo - (none in 2009)
Schwinn Sporterra Comp (2010)
Schwinn Super Sport GS, Ultra 1, Ultra 2 (2008, 2009)
Trek Pilot 1.2, 5.2 (2006)
Trek FX (7.5 FX starts the carbon fiber fork)
Raleigh Cadent FT2 2008 - carbon fork - $630 REI
Marin Fairfax Bike - 2009 - carbon fork
Marin Mill Valley Bike - 2009 - same as Fairfax but lighter/better?
Motobecane Cafe Sprint
Specialized Sirrus
Ibex Corrida
Bianchi Iseo
Bianchi Torreno
Rocky Mountain RC30, 2008
Felt X-City 2, 2009 (25.1lbs, $900)
Diamondback Insight 2 or 3

more:
http://www.thebikedr.com/Commuter-Bikes/
http://bikesdirect.com/products/road_bikes.htm