Nice DIY logbook here, gentleman who made it suggests printing on "write in the rain paper". Makes good sense to me.
ht tp://www.oregonshooter.com/index.php/articles/view/rifle_logbook/
On my laptop I have a file. Befor I go out shooting the info on all my rounds is allready noted. When I'm shooting i jot down the temp, wind, and elevation as well as my chrono results. I also take pictures of the targets.
When I get home I download all the data and keep it orginased in the shooting file.