Did you take a screenshot of your PC with a cell phone? =p
Honestly, I think this a good thing. No ones paying money for a shitty mod, ergo to earn money, mod developers will have to stepup their game.
The reason the music fades is probably because Source has never handled transitioning well when music has played - it would repeat the same damn section over and over. Not sure if the commentary mode is any different but its also available let in pretty much every Source Valve game.
Now I hope...
I wonder if this means developers will be able to setup their own curated stores soon - I'm sure a lot of developers would like the large amount of creation this brings.