Multi wavelength behavior of blazars in the AGILE era

The AGILE gamma -ray satellite accumulated data over two years on several blazars. Moreover, for all of the sources detected by AGILE, we exploited multi wavelength observations involving both space and ground based telescopes and consortia, obtaining in several cases broad-band spectral energy distributions (SEDs) which span from the radio wavelengths up to the TeV energy band.

I will review both published and yet unpublished AGILE results on gamma -ray blazars, discussing their time variability, their gamma -ray flare durations and the theoretical modeling of the SEDs. I will also highlight the GASP-WEBT and \swi{} fundamental contributions to the simultaneous and long-term studies of gamma -ray blazars.