Hi Bart,
A couple questions ...
I just finished reading through the Pound mailing list thread you initiated this past February. From that thread resolution (hard work!), it looks like the latest and greatest Pound will work with AOL Server. What version of Pound are you using on your production server(s)?
As far as I can see, the only additional security risk of using a reverse proxy is that you are adding another layer, and that layer (the reverse proxy) may have some kind of exploit. This risk looks minimal with Pound. Did you have any other risks in mind when you wrote the parent post?
Finally, can you provide any data points on RAM vs. # of AOLServer Instances? I have a box with 512MB of RAM that I will be using for virtual hosting and I am considering using AOLServer and OpenACS. (Catherine Meeks gave me a brief overview at a conference this weekend, and I'm pretty excited by the possibilities ...)
Mark