I will be implementing a medium sized online book store over the next 
few months.  I would like to do most(if not all) of the backend in 
ruby.  I don't have any real experience building large database driven 
online stores so I was hoping for some suggestions as to which 
frameworks/libraries might prove useful.  I am currently planning on 
using mysql to store everything and paypal for payments.

Thank you,
Matthew Margolis