X11::Fvwm is not really a GUI library, just a module to get access to fvwm-specific functions. It is not possible to build a GUI application with X11::Fvwm only.
X11::Protocol got a recent update, but given the simplicity of this module I would consider X11::Protocol to be rock stable for all times :-)
The Perl/Tk FAQ is still maintained and updated, though there's a lot of historical information in it which should really be removed.
Snippets of code should be wrapped in
<code> tags not<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).