After reading over my other question, Using a Relational Database for Schema-Less Data, I began to wonder if a filesystem is more appropriate than a relational database for stor
There's a big example of an implementation at Amazon's S3.
http://aws.amazon.com/s3/
This sort of implementation is where a lot of companies are moving towards, because it scales fundamentally better than a relational database can. The approach is simple, and it works, and for some problems, it's a great solution. In the case of Amazon's S3, it's particularly nice for cloud storage, if you don't want to have to worry about the hassles of storing the data yourself.