Give a guest book feature to Gallery2.
This guest book is in look based on http://sourceforge.net/projects/instphpmysqlgb by Jeremy Lui. Just used there look/feel to create a version for Gallery2.
About code for Gallery2 usage new code is used but the look is almost same.
The Guestbook for Gallery2 has some options:
New features to put in
Download the module from: http://www.ruudvaneijk.net/download/guestbook-v1.0.0.zip install and activate the module.