Keep in mind that you do not need to convert your font files again, just replace your old cufon-yui.js with a new one and you're good to go. As it currently stands, version 1.09 does not work in IE9 beta which was just released. Just in case it doesn't work in the final version either, we've implemented a fix in the latest development version. There will be a new release some time in the near future. Meanwhile, there are also a few ways to fix your site without having to update your cufon-yui.js.
You might also want to take this opportunity to try Typekit, a hosted, @font-face-based alternative. On Windows, you may first have to copy the font file out of the Fonts folder and paste it elsewhere in order to be able to select it. Currently only TrueType (TTF), OpenType (OTF), Printer Font Binary (PFB) and PostScript fonts are supported. The Easiest Way to Use Any Font You Wish. CSS 3 is on the horizon, and we're all getting excited.
The amazing rise of this new font resource has made this plugin the most popular font plugin on WordPress and it shows no signs of stopping. While font plugin solutions like FontBurner.com have helped bring rich typography to WordPress themes, the selection of fonts easily available to the average blogger have been limited. The WP Google Font plugin makes it even easier to use Google's free service to add high quality fonts to your WordPress powered site.
Not only does this plugin add the necessary Google code, but it also gives you the ability to assign the Google fonts to specific CSS elements of your website from within the WordPress admin. Or if you would rather, you can target the Google fonts from your own theme's stylesheet. Right now, the Google Directory has hundreds of great fonts, and the selection is steadily growing.