Syncing gnus / leafnode on laptop

[Hadron Quark]

I have new laptop running Ubuntu.

My main machine runs leafnode, fetchmail & procmail to sort out my
maildir stuff - all nntp and mail is done in gnus.

Anyone give me some ideas on where to start thinking/looking for a sync
option between laptop and main machine? Ideally "on the road", the
laptop would use wireless and get latest news via leafnode, & email from
my pop3 accounts. When I'm home ditto for the home machine. But Id like
to merge the two sets. Any suggestions/ideas/pointers that can get me started?