SEO refers to Search Engine Optimisation. SEO is the process of improving the volume and quality of traffic to a web site from search engines. SEO can also be referred to as SEF, or Search Engine Friendly.
Joomla specific SEO / SEF tricks include:
Posted by dextercowley in regards to correcting a problem when enableing Search Engine Friendly URLs in the Global Configuration of Joomla 1.5.2 and tested and verified to be true for 1.5.3 as well.
" ... edit configuration.php as var $live_site = 'http://www.mysite.com' "
Note that default configuration.php is var $live_site = ''