The RandomLinkButton plugin has been upgraded to version 0.5. The new version has fully working category selection now, together with the option to specify that target for the new page to open in.
The other change in the plugin is that I’ve moved all the data access to use WordPress functionality supplied by the framework. This is because v2.1 has different tables to previous version and now includes an abstraction layer to make things easier for plugin developers. The down side of this is that plugin will NOT WORK on previous versions of WordPress, so I think I’ll put up version 0.4 for pre 2.1 users.
Let me know if you have any feedback.