I installed two times the mod and smf and seo4smf doesn't work.
The urls are the same old. I enable it in "Search engine friendly urls" option. From the readme i see it has not what other to do, only the .htaccess file, but the urls are still not se friendly, to be rewritten by mod_rewrite.
I am using apache web server.
You can see my forum here
http://checkyourpr.net/forums/but add this line in your hosts file first (i am sorry for this)
85.130.100.216 checkyourpr.net