I recently read this very interesting article on designing websites for mobile phones. The article focuses on usability aspects of mobile websites with some snippets of HTML and CSS code. The good point about the article is that it does not focus on any particular mobile OS or technology making the tips are completely neutral in description.
Some more supporting links that I came across about designing mobile web experiences and thought I could share -
Great stencils which are very helpful when designing for mobiles.
Wordpress Mobile Plugin for WordPress users
WPtouch iPhone Theme for WordPress driven sites (for iPhone or iPod touch)
Making a mobile friendly version of your blog with Google reader