I'm obviously not really trying, I've only generally got two on the front.
Front
Exposure Race Maxx
CatEye Snapshot Plus - but I managed to damage the mounting so...
CatEye EL500 - but it made a dash for freedom on Tuesday, and no longer works so...
Niteflux Photon 4 Commuter - not a very good beam pattern, and a pain in the butt mounting (Cold Spare)
Back
Dinotte Tail Light (the old "dim" one!)
CatEye TL-LD1100 (Hot Spare)
CatEye TL-LD1000 (Cold Spare)
I've also got some NiteZone RedEye bar end lights, but I don't really count those as rear lights, since they are relatively dim.