I just like to share what I hardly found around googlin'
I wanted to make a 301 redirection of old urls like :
http://mydomain.com/?param01=val01¶m02=val02
to
http://mydomain.com/param01/val01/param02/val02
RewriteCond %{QUERY_STRING} param=(.*)$
RewriteRule /$ /param/%1? [R=301,L]