Besides this news group, where there are several well informed FZ owners, there
are a couple of active Panasonic FZ on-line forums you can visit to get more info -

Low traffic - but very helpful in a wide range of FZ use related topics -
http://www.dcresource.com/forums/forumdisplay.php?f=26

and

High traffic - there are some gems here but you have to put up with a lot
of non-technical FZ enthusiasm -
http://forums.dpreview.com/forums/forum.asp?forum=1033

You won't want to miss this site -
http://www.users.bigpond.com/vkelim/DMCFZ10/

or this one if you ever decide to add extra filters or lenses to you FZ camera -
http://www.cs.mtu.edu/~shene/DigiCam/User-Guide/FZ-10/index.html

I don't know of any books on the subject  but you might find these sites
of general interest, especially the first one -

Good stuff here - http://luminous-landscape.com/

More - http://www.bobatkins.com/

Steve's Forums (part of Steve's DigiCams site) has a good Panasonic
forum where discussion seems to center around the FZ line.  The other
sites (dpreview and dcresourse) recommended earlier are also good but I
still find myself coming back to Steve's more frequently than the
others.

http://www.stevesforums.com/forums/view_forum.php?id=23