I just found an issue in 0.1.2 and 0.1.3 (using both Blender 2.62 and 2.63) -- if I create object with "Enable meshlight" option set and then use it in particle system as a particle, the only render mode which renders light out of particles correctly is "Path tracing". Neither SPPM, nor Bidirectional nor any other show any light at all. Any of photon-mapping render methods print out error message:
INFO: SPPM: Rendering pass 1 of 1000...
INFO: SPPM: Starting Photon tracing pass...
INFO: SPPM: Light(s) photon color testing for photon map:
INFO: SPPM: Building photon map...
ERROR: SPPM: lightPDF sample error! 0/0... stopping now.
Bidirectional render is not possible, because it can't find any light source.
I've tested with GPU enabled photon mapping in 0.1.3 -- same issue.