I received an email from a developer at Carina Software; they're celebrating the anniversary of the Apollo 11 Moon landing by offering all their downloadable software for free! This includes their SkyVoyager iPhone app, which I know is very popular. I have never used their software, so I cannot vouch for it, recommend it, tell you to stay away, or whatever. But I do know a lot of folks like the stuff Carina puts out, and I'll be downloading SkyVoyager myself.
This offer is for Monday only! So grab 'em while you can; SkyVoyager is usually $15. Just to be clear, I'm not endorsing this product, just letting y'all know about a freebie.