Ever since I wrote Embedding Fonts in your Web Site with CSS and @font-face many people have been emailing me with questions about adding new fonts to their sites. One of the easiest ways is with The New Google Font API but there are also a few others resources available. Here is a list of places to find fonts and tools you can use to include them in your Web site.
Font Squirrel has an amazing library of free commercial-use fonts. All of the @font-face kits that are available in my Premium themes come from Font Squirrel. You can download fonts to use in desktop publishing or you can grab some @font-face kits to use on your Web site. There is even a handy, simple to use tool for converting standard fonts into @font-face kits for embedding on your Web site.
Google Font API
I wrote about this one already so just check out that article.
TypeKit is a subscription-based service that allows you to link to fonts from many different type foundries. Subscription costs range from free to $99.99 per year. A free account allows for 25,000 pageviews a month and a limit of 2 fonts throughout you site. It is a great way to test out the service to see if it is right for you.
This one is very similar to the Google Font API but it offers a wider range of resources of available fonts. You can use Google Fonts, TypeKit, Ascender or custom fonts.