Recover AVRs which are fused wrongly

Here some tips on how to recover AVR Microcontrolers which are fused wrongly.
http://www.evilmadscientist.com/article.php/avrclockbits

And the other one

http://www.larsen-b.com/Article/260.html

I will try this some time and hope will be able to recover some of my AVRs