  We present number counts, luminosity functions (LFs) and luminosity densities
of galaxies obtained using the Sloan Digital Sky Survey Sixth Data Release in
all SDSS photometric bands. Thanks to the SDSS DR6, galaxy statistics have
increased by a factor of ~9 in the u-band and by a factor of ~4-5 in the rest
of the SDSS bands with respect to the previous work of Blanton et al. (2003b).
In addition, we have achieved a high redshift completeness in our galaxy
samples. Firstly, by making use of the survey masks, provided by the NYU-VAGC
DR6, we have been able to define an area on the sky of high angular redshift
completeness. Secondly, we guarantee that brightness-dependent redshift
incompleteness is small within the magnitude ranges that define our galaxy
samples. With these advances, we have estimated very accurate SDSS DR6 LFs in
both the bright and the faint end. In the {0.1}^r-band, our SDSS DR6 luminosity
function is well fitted by a Schechter LF with parameters Phi_{*}=0.90 +/-
0.07$, M_{*}-5log_{10}h=-20.73 +/- 0.04 and alpha=-1.23 +/- 0.02. As compared
with previous results, we find some notable differences. In the bright end of
the {0.1}^u-band luminosity function we find a remarkable excess, of ~1.7 dex
at M_{{0.1}^u}=-20.5, with respect to the best-fit Schechter LF. This excess
weakens in the {0.1}^g-band, fading away towards the very red {0.1}^z-band. A
preliminary analysis on the nature of this bright-end bump reveals that it is
mostly comprised of active galaxies and QSOs. It seems, therefore, that an
important fraction of this exceeding luminosity may come from nuclear activity.
In the faint end of the SDSS DR6 luminosity functions, where we can reach 1-1.5
magnitudes deeper than the previous SDSS LF estimation, we obtain a steeper
slope [ABRIDGED].
