If you looking to make your WordPress blog more mobile friendly, look no further than MobilePress – it’s a free WordPress plugin that instantly provides a great looking mobile version of your site.
The layout depends on the mobile phone browser.
You have the freedom to design your own mobile themes if you aren’t too happy with the defaults. What I also liked about Mobile Press is that it tweak the layout based on the mobile phone browser.
So if someone is reading your site on an iPhone, he’ll see a more iPhone like layout that will be different from what is displayed on a mobile phone with Opera Mini or say Windows Mobile.
If your blog is not hosted on WordPress, you can still create a mobile friendly version of your blog quite easily through Google Reader