Evidence for dark energy: cross-correlating SDSS5 and WMAP3
  We cross-correlate the third-year WMAP data with galaxy samples extracted from the SDSS DR5 (SDSS5) covering 16% of the sky. These measurements confirm a positive cross-correlation, which is well fitted by the integrated Sachs-Wolfe (ISW) effect for flat LCDM models with a cosmological constant. 
Cabre.A, Gaztanaga.E, Manera.M, Fosalba.P, Castander.F