Google now announced that "you can use Ascender's FontsLive web font service with WebFont Loader."
"WebFont Loader was designed to make it easy to switch between different providers of web fonts, including Google, Typekit, and others. Ascender module provides users of FontsLive service with enhanced controls over how web fonts are handled by various browsers. WebFont Loader provides developers with advanced features to manage how web fonts behave, establish better consistency across all browsers and even set fallback font size to more closely match web font, so content doesn't reflow after loading," explains Google.
More Info: WebFont Loader