If you don't have an RSS feed subscription on the Google Webmaster Central Blog yest, I strongly advice you te get one…
On there latest post they included an nice basic SEO Starters Guide from Google which you might want to forward to some of your customers.
What better way to educate them then sending them a document produced by the Guys that know Google the best.
Af course it is just a basic SEO Guide, but it shows some fine examples of things you need to get done for better rankings.
I personally like the explanation about why you need to have the best URL possible.
For Joomla webmasters this is still an issue, although Joomla 1.5.x “out of the box” is a lot better then Joomla 1.0.x but still not the way I want them.
P.s. don't forget to update your Joomla 1.5.x to the new Joomla 1.5.8 version! ?(if you use the SEF Patch from Joomlatwork.com you better wait for the update… looks like that could take some days.