[Tilecache] TileCache in Amazon s3 - Specify different bucket per layer

[Bruce Rindahl]

I have a Amazon EC2 machine running tilecache to my S3 account and am 
very happy with the performance - Thanks!  The one new feature that 
would help is to specify a separate S3 Bucket for each layer.  This is 
similar to the file cache where each layer gets a different directory.  
The reason for this is the S3 storage is one big massive blob (hence the 
term bucket).  Some of my layers are fixed - i.e. aerial photos taken 
July 2005.  Others will need to be updated as the data changes.  This 
would be simple if I could specify different buckets per layer.  I am 
using the S3.py library instead of boto if that helps.
Thanks!
Bruce