  We present a cross-correlation analysis of the WMAP cosmic microwave
background (CMB) temperature anisotropies and the SDSS galaxy density
fluctuations. We find significant detections of the angular CMB-galaxy
correlation for both the flux limited galaxy sample (z~0.3) and the high
redshift (z ~ 0.5) color selected sample. The signal is compatible with that
expected from the integrated Sachs-Wolfe (ISW) effect at large angles (\theta >
3deg) and the Sunyaev-Zeldovich (SZ) effect at small scales (\theta < 1 deg).
The detected correlation at low-z is in good agreement with a previous analysis
using the APM survey (z~0.15). The combined analysis of all 3 samples yields a
total significance better than 3 sigma for ISW and about 2.7 \sigma for SZ,
with a Compton parameter y~10^(-6). For a given flat LCDM model, the ISW effect
depends both on the value of \Omega_\Lambda and the galaxy bias b. To break
this degeneracy, we estimate the bias using the ratio between the galaxy and
mass auto-correlation functions in each sample. With our bias estimation, all
samples consistently favor a best fit dark-energy dominated model:
\Omega_\Lambda ~ 0.8, with a 2 \sigma error \Omega_\Lambda=0.69-0.86.
