From eMarketer, always good at nifty spiffy charts and graphs:

“Requiring the installation of extra software to view the site” can mean a Flash install (yawn) or a spyware install (not good). 

I agree with all of these, but let’s be real: Sites that automatically play music should be banned from the Internet! Nothing worse than going to a site and having a Fur Elise midi file or techno playing. 

Alex Eckelberry
(Thanks to techdirt)