Microformats & Microdata
If you've got information on your website don't you think it would be useful for search engines to understand what kind of information it is?
Microformatting presents your website content exactly as you want it to appear, however it also relays specific descriptions to search engines, web browsers and web applications, allowing them to present your content as structured data and deliver it further into the web.
Would you like your complete contact details to be added to a user's address book with the click of a button? Would you like your events to be easily imported into their calender or your location automatically mapped? With Microformats rapidly increasing in popularity and use (especially with Google), this is an excellent SEO marketing strategy that cannot afford to be ignored.