What are the most successful online businesses?

What are the most notable recent examples of successful web/mobile consumer subscription businesses?

I am interested in finding examples of the most successful recent web/mobile consumer subscription businesses and the strategies/tactics they employed that helped make them so successful. http://Mint.com? Evernote? Pandora? Others? Any insight would be appreciated.
Answer:

DropBox

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Other answers

A company that has seen great growth over the last couple years, had an amazing Launch Conference, and is a personal favorite of mine is BrandYourself (http://www.brand-yourself.com). They are a personal branding and online reputation management service. The co-founders are great guys too.

Justin Groden

DropBox and Spotify. I think they both provide a lot of value to the customer at a relatively inexpensive rate, and they have the freemium model working for them.

Christina Lay

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