  We investigate various pixelizations of the sky which allow for fast
spherical transforms, for implementation in full sky CMB experiments such as
Planck and MAP. We study the effect of varying pixel shape and area on the
extraction of the CMB power spectrum. We argue for the benefits of having a
truly azimuthal, or `igloo' pixelization. Such pixelizations are simple and
allow for fast, exact simulations of pixelized skies. They also allow for
precise correction to be made which accounts for the effects of pixel smoothing
on extracted multipole moments.
