[Phpwm] Non-Relational Databases

[Alex Mace]

Hello all,

Has anyone played around with any of the non-relational databases that  
seem to be getting a bit trendy? I'm thinking of things like Apache  
CouchDB, Amazon SimpleDB, Google BigTable (part of the App Engine I  
believe?). I've only ever worked with or been taught about relational  
databases and I'm wondering what, if any, benefits these could give  
me. I've got an inkling that they're useful for storing and querying  
large amounts of arbitary data. Perhaps something thats useful for  
data mining?

Thoughts?

Alex