My stacksize is set for [expr 128 * 8192], I think that's the default.
Memory footprint is currently 200mb but it also grows depending on traffic.
For a long time I've been suspicious that there's a memory leak somewhere in either OpenACS or AOLserver. After many iterations working on this with Dossy we still haven't found anything in AOLserver, but I haven't taken a good hard look at OpenACS in a while.