Last night in Marina Del Rey (May 13th 2011) I saw something similar to the red and blue light over Marina Del Rey video I just saw on your site
At first I thought it was an airplane with a green light, then as it went up, it started to fall. I thought someone was shooting off fireworks, but after it's initial "fall", is swooped up again and did a huge loop and then in a straight line, then hovering then up again and another loop, then disappearing behind cloud then reappearing with the same sort of "dance".
It went in a straight direction across the top of a building then disappeared. (this dance took about 2 or 3 minutes)
Initially I just wasn't sure what I was seeing. I was in an apartment building that is on the water on Fiji Way and was looking out across the inlet to the other buildings. The light was so bright and changed colors intermittently, but with now clear "pattern" of timing like an airplane light flickering.
So then I thought that maybe someone was on the roof of that building and was flying a remote controlled airplane with a light, but the distance seemed way too far away for the light to be that bright and also it was so high in the air and it was at night.
I'm not sure how someone could control it the way it was flying. Anyway, I looked up "UFO sighting May 13th, 2011 Marina Del Rey" on Google and one of the things that came up was your site and I saw the video and it looked really similar. You asked if anyone had seen something similar to email you. Well, here 'tis :-)