Update July, 3rd 2009: Added 12 local SEO & search resources suggested by readers in the comment section and on Sphinn + some newly researched links.
The most obvious trend when it comes to SEO is “going local”. Ever since Google introduced Google Maps and Local Business Center and later added local search results to Universal Search displaying them on top of everything else businesses everywhere strive to be there. Additionally the proliferation of smartphones and netbooks accelerates this development even more.
You have to perform in local search and on sites that enable users to find local businesses in their respective area. Classic SEO is just not enough anymore for small business owners and location based big business.