I have today, as planned, released Simple Forum version 2.1 and it is now available for download along with the User and Troubleshooting Guide. (See the Simple Forum plugin page).

This is a recommended upgrade for all users - including those on the beta or RC1 releases. A few days ago I was made aware of a SQL injection hack that can be used against the plugin to obtain the admins user credentials. This should now be fixed and addressed in the 2.1 version. This has meant that some very late code has been added to this release which has not had the benefit of a month of testing. if any problems are found because of this, I will issue patches as necessary.