  We present the latest results from our project to search for new planetary
nebulae in nearby galaxies using Sloan Digital Sky Survey (SDSS) imaging data.
Our method is based on photometric criteria and can be applied to galaxies
where PNe appear as point sources. We applied these criteria to the whole area
of M31 as scanned by SDSS, detecting 130 new PN candidates and 30 known PNe.
All selected PNe candidates are located in the outer regions of M31. For 85
candidates follow-up spectroscopy was obtained with the 2.2m telescope at Calar
Alto Observatory. The observations show that our method has a detection
efficiency of about 82%. We discuss the 2D velocity field of the outer part of
M31 based on our observed PN data. The PNe suggest an exponential disk scale
length of 13 kpc along the minor axis. We discovered two PNe along the line of
sight to Andromeda NE, a very low surface brightness giant stellar structure in
the outer halo of M31. These two PNe are located at projected distances of ~48
kpc and ~41 kpc from the center of M31 and are the most distant PNe in M31
found up to now. Our data support the idea that Andromeda NE is located at the
distance of M31. No PNe associated with other M31 satellites observed by the
SDSS were found. Applying our method to other SDSS regions we checked data for
the Local Group galaxies Sextans, Draco, Leo I, Pegasus, Sextans B and Leo A
and recovered a known PN in Leo A. We re-measured its O/H and for the first
time determined abundances of N/H, S/H, He/H as well as the electron number
density Ne. We argue that the PN progenitor was formed ~1.5 Gyr ago during the
strongest episode of star formation in Leo A.
