Chris Pirillo says,

The ala carte iPod Video store is getting worse, not better. If you watch only one TV show per week (and you don't already have a cable subscription), I'm sure their efforts are a godsend. However, if you're like me, and already have three DVRs in your house to record all the shows you want to watch, this lack-of-subscription thing is an absolute nightmare.

...I'm thoroughly disappointed that I can't take my Napster subscription with me on my PSP or iPod. Instead, companies want me to spend even MORE money for LESS freedom - and to complicate my life even more than it was before. The sad thing is, many folks walk into it blindly thinking it... "looks like fun." Bullshit. It's all Bullshit, and Apple's leading the bullshit charge (albeit with style).

Bullshit?  Hmm.  Convenient?  Yes.  It's all about variety and viscousity.  Offer just enough variety with a low viscosity among the key moving parts (discovery, purchase, and download) and you're set. It's just another take on the path of least resistance.  Nature doesn't lie.

Perhaps we need a viscosity index for software experiences end to end?