Triple stores as services?

Greetings.

Are there any triple stores available as online services?

There are a few services which let you store data online, to take  
away the hassle of setting up and maintaining your own hardware and  
database interfaces; Amazon S3 is a well-known example (though it's  
not SQL, of course).  Does anyone know of a similar thing providing a  
SPARQL endpoint?

The reason I ask is that I'm involved in a project which will want to  
be exposing of order 10^6 triples to the web, and a colleague  
suggested that there's a category of hassle we could potentially  
avoid if we could give someone (a little!) money to look after this  
in some corner of their vast disk farm.

Or is the semantic web not a commodity yet?

All the best,

Norman


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Norman Gray  :  http://nxg.me.uk
eurovotech.org  :  University of Leicester, UK