Thx for the various suggestions. It appears that some of you have AOLServer roll server.log itself, and others of you use a system utility. TMTOWTDI I guess, though is there some reason to prefer the former over the latter?
Anyway, I set LogMaxBackup in nsd.tcl (and restarted AOLServer of course) but in 48hrs now no rolling of server.log has occured. There must be something else to set somewhere? Or perhaps the problem is that I'm using AOLServer 3.2-4 packaged by Debian and not an 3.2-adx version. Perhaps the log rolling stuff was added by the OpenNSD effort?
Perhaps I should move this thread over to the OpenNSD site...