What are some techniques y'all would suggest I employ if I wanted to  
implement federated search against my growing collection of SRU- 
accessible indexes?

The primary purpose of SRU seems to be to provide a standard, XML- 
based interface to Internet-accessible indexes. Yet, with my growing  
collection of SRU-accessible indexes, and considering people's  
expectations for searching multiple indexes simultaneously, it might  
behoove me to implement a federated interface to my indexes. How  
might I go about implementing such a thing?

-- 
Eric Lease Morgan
University Libraries of Notre Dame