There's nothing on that page except useless talk and a chart. There are hundreds of other NOSQL highly distributed, available, blah blah blah databases. Why should I choose Riak? Why not MongoDB? CouchDB?
And I challenge you to find a link on that page that tells you anything more. All other links are just as bad: http://basho.com/technology/why-use-riak/ and http://basho.com/technology/architecture/ and http://basho.com/technology/technology-stack/ and http://basho.com/technology/technology-stack/ - The wiki is also not good at all: http://wiki.basho.com/Riak.html
They are just spec sheets and vague sentences. For God's sake, show me a sample project. A to-do app so I can get my head around all these new concepts...
It's been 6th or 7th time in the past year that I've stumbled upon your site and was mildly interested to know more about Riak, but the docs are so horrible that I know "nothing" about it.
I gave a (introductory) presentation (to an undergraduate class) about MongoDB after 10 hours of reading their site and "The Little MongoDB Book"[1] and hacking around with it (that's how good and thorough they explained their system). I'm not sure how much it would take for me to understand enough of Riak to explain it to someone.
That guy also wrote a decent "Little Book" on Redis, which I also found extremely compelling. Please, if you like your product and want to see more people use it, write a better documentation. Or hire Karl Seguin to write one for you!
[1]: http://openmymind.net/2011/3/28/The-Little-MongoDB-Book/