Just released SMF Archive. This mod is very easy to install requires no file edits and works with most versions of SMF.
Adds a lofiversion of your forum which appears in SMF Archive.
Easy to install just upload two files to your root forum directory.
Features: Support for BBC code for 1.1 and 1.0.x in posts. Easy to customize as well you can add your code to the headers and footers and customize the css file.
Allows search engines to help spider your forum easier.
Other idea maybe if your site has a lot of traffic redirect it to SMF Archive.
Check it out athttp://www.smfhacks.com/hackid-9.html