I like to use Google Webfonts on my commerical works, but they render a bit too jagged, though in the preview provided by Google, they render very smooth.
Check this out: http://www.google.com/fonts/specimen/Oxygen
The biggest preview seems very nice and smooth but when I import it on my page and use it, it seems distorted on the edges, very jagged. Does Google use an extra library to achive this anti-aliasing or is it me doing something wrong?
If you uninstall the font from your system (windows/fonts folder), you should be able to see it smooth. To overcome this. Do not use the @import or direct link from google. Rather download the package from www.fontsquirrel.com (the whole web font kit) and use @font-face in your css to get smooth fonts.