This afternoon, I have thrown together a Gallery Latest entries Module, this is for installing as a module into Joomla, not as a gallery plugin into Sobi2, its not pretty code, but it seems to work ok, it was hacked together using parts from other components, the Sobi2 Vscroller Module, the Joomla latest News Module and other bits of php from around the web.
It allows you to set the number of colums and rows of images that you want to display ina block, and set the width of the module, each image links through to the details page of the particular Sobi2 entry.
heres a link to the file
Backup your site and database before you even think to use it, I have only tested it on Joomla 1.0.15 with Sobi2 from v2.8.7.2 to latest v2.9.0, this only works if you have Joomla with Sobi2 Component and the Sobi2 Gallery Plugin installed.
Try it, and if you hack at it and improve on it, please send me a copy of your update.