For css -webkit-font-smoothing you may try between "antialiased" and "subpixel-antialiased", then there is css text-rendering: optimizeLegibility.

Also you should notice a bug in Safari for OS X that turns off antialiasing: http://seanmcb.com/typekit/webkit-antialiasing-test.html

Google has free webfonts that are already prepared for including in different browsers, you may consider them: http://www.google.com/webfonts, also there is http://www.kernest.com/.

FontSquirrel was already mentioned in this thread.