You might want to have a look at Practically Sailing - The best sailing ideas and techniques on the Internet
. It's a new site authored by Joe Cooper, who's with Hood Sails in Newport. There are several articles on the topics you mention, including full battens for cruising boats, how to measure for new sails, etc. As I said, it's a new site and all the bugs haven't been worked out yet, but if you stick with it you'll work yourself around to the things that are of interest.