Nosql is a good idea and in my opinion a Graph database is very good system 
to e-commerce, because the graph concept is easy  to  make a recommendation 
system.

My suggestion is:

http://www.hypergraphdb.org/index   ( It's a very versatile DB)

http://www.orientdb.org/index.htm    

http://neo4j.org/  ( please read the License model. I think It's have a 
limitations in the license)

If you preferred a Key Value database my suggestion is: RIAK (because it's 
in Erlang not Java and Riak have a native integration to search engine not 
only lucene )

regards
Joao Martins

Em domingo, 22 de julho de 2012 11h08min27s UTC-3, dvbportal escreveu:
>
> I was going to advise you to use NoSQL. I just finished a basic Node.js 
> CMS engine and I am happy with it. I wrote it in a few days which I 
> couldn't have done without the flexibility of NoSQL. The more people you 
> ask, the more opinions you get. 
>
> I chose a generic database agnostic model to build on. The node.js server 
> is just providing an API. The rest of the app is implemented on the client 
> using backbone. 
>

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