First, the 33rd Carnival of Space is up at Fraser's place, so check it out.
Also, a mystery unfolded earlier this week: several readers emailed me saying they saw a comet-like object high overhead on Monday night. There was speculation that Comet Holmes might be in outburst again... but now it looks like it was a fuel dump by a rocket booster.
If you see something like that, a good place to go is the BAUT forum and report it. Other astroenthusiasts can then try to confirm the sighting.