Dr. Horrible's Sing-a-Long Blog

Have any of you heard of this or seen this?  I don't know my fascination with it, but I actually enjoyed it.  It's a strange humor, and strange plot.  But for some reason I liked it.  It could be because of how I think it has stolen some ideas from Vanessa's and my Adventures in Space.  (If you don't know what that is, don't stress yourself over it.)  It could also be because I'm a Neil Patrick Harris fan.  Anyways, it was a movie created and aired online during the writer's strike last year.  Here are two of the songs from the movie:

I think you can see the whole movie on youtube if you want.