In reply to Web Font Usage - How much is too much?:
At Webtype, we optimize the rendering of our fonts for both legibility and loading time and we also offer the ability to subset by character set to improve performance further. Many of our customers use Webtype for their entire sites and haven't noticed any performance issues. For example, check out Loewe, which uses 5 variations of Benton Sans.
Also, we offer several versions of Benton Sans and Benton Modern specifically designed from the ground up to be used at small sizes--Benton Sans RE and Benton Modern RE--from the Reading Edge series. Many customers pairs these with the display-sized versions of Benton Sans/Modern on their sites.
Finally, we offer a free, 30-day trial for any font from our catalog--you can try them yourself and see if you notice any performance issues. If you have any specific questions, feel free to reach out to me directly: paley@webtype.com