XChat 2.6.1 will contain a feature that can rotate logs (i.e. log filename changes after some time/date). Although it'll be configurable, what should the default setting be?
%c = Channel name
%n = Network name
%F = date in YYYY-MM-DD format
For example, the first choice in this poll would give you:
2005-11-09/FreeNode-#xchat.log

