Major changes:

* Better DefaultLayouter for picture galleries
* Output names for page files now customizable (see PageHandler documentation)
* On-the-fly creation of thumbnails for pictures with RMagick
* New tags: sitemap
* Tag lang renamed, new name langbar!
* New parameters for menu tag
* Automatic checking of HTML files on their validness
* Fixed bugs

Thanks for all the feedback!

Homepage at http://webgen.rubyforge.org was also updated!