It's something to consider down the road, but I have a bunch of other features I would consider doing before that.
Note however there is now an XML API for retrieving checkins from a previous net. Look at:http://www.netlogger.org/api/help
for the programming specification. Perhaps someone else can develop a tool to do this using that spec. That would probably be better since it would work after the net was closed, i.e. you wouldn't have to remember to generate a PDF before closing the net.
This API is provided by the author of the server software, K0JDD. It hasn't been determined how long previous net data will be preserved on the server, but it will probably be at least 30 days. Note also that the next version of NetLogger will have support for looking at this data from within NetLogger, and being able to load the check-ins data from a previous net into the Check-ins table.