IMO having the logo aim to the right so to speak just looks wrong
The black & orange scheme is not really part of the logo. It can be done in various other combos too - as long as the shape remains the same it will still be recognisable which is the main thing. I did a few variations of option A that you can see here: http://www.flickr.com/photos/james_nash/tags/mobbler/ (might add a few more later if I have time). You can also find some option A-based app icon examples here: http://code.google.com/p/mobbler/issues/detail?id=194 . I made all of those before I made the option B logo, but you can mentally substitute B for A in all the examples above :-)
To be completely annoying, I'd say something more in line with the audio scrobbler icon that's present at the moment.
Not anti mobbler icon, just something complimentary, but hat might be because I like red more than orange.
That said, I voted a, mostly because of the note direction.
I agree with Ben. The musical note is a li'l screwed up in the second option :)
I voted for option A because the note is the right was around. Anyone with any musical literacy will laugh at the mirror-image quavers in option B.
The top one I think, but both are great