[plt-scheme] production use of PLT servlets

I'm interested in hearing about people's experiences using the PLT Web 
servlets with stored continuations.

My motivation is that, now that I'm looking for new 
consulting/employment, I want to be able to recommend PLT Scheme for the 
new work, as appropriate.  For Web sites, I have experience developing 
production servers using PLT Scheme Apache CGI but not using PLT servlets.

I suspect that, if a PLT process can handle, say, 1000 simultaneous 
sessions with rock-solid reliably, and with reasonable CPU/memory 
requirements, then it can scale by a combination of distributing 
sessions across servers and gracefully expiring PLT processes (to clean 
up any memory leaks).

Noel Welsh has already given me some information about Untyped's 
successes with servlets.  I'd appreciate any other experiences people have.