Smashing Magazine has a great post comparing the various @font-face hosting companies. There is a lot of early competitors, but I feel like we will see the list shrink, and less sites can provide something competitive. There are so many options that finding the right typeface hosting site can be a little overwhelming.
There has to be some way to centralize typeface hosting. Maybe we will see that as the use of @font-face and its hosting sites supporting it become bigger.
@font-face comparison chart
Top Web-Based Typeface Hosting Site Comparisons