Mog has way better editorial and music discovery features. Also Mog has a radio feature that lets you listen to any range between artist only radio and pandora like radio which you can modify at will... if you start in listening to it pandora style and decide you want to start listening only to a single artist, you can just move a slider.
I was reading the comments of the Techcrunch article and someone mentioned Grooveshark: tried it out today and within in seconds I was listening to all my favorite songs without signing up. Of course within minutes I signed up because I wanted to save my playlist. UI was extremely clean, fast, and intuitive and worked excellently in my outdated Firefox browser on linux.
Just now I went to mog.com... "discover music through people and people through music"... and "where music listens to you"... and "Better Than Rhapsody, Pandora and iTunes... Combined.". Lame first impression.
I click "Try it free"... but I have to enter my email, screenname, password twice, TOC checkbox, and a captcha. screw it! Then I'll have to pay later?
Of course, will Grooveshark the Audiogalaxy (but better) of 2009 survive as it is today?
And as far as long-tail catalog depth... I'll need some more man-hours to see how deep it goes, I'm assuming Mog will be deeper and have better discovery features. I mean you have to pay money for it, it has to be better in some way I guess.
