The leading edge of Web Design
In the leadup to the release of Firefox 3.5, hacks.mozilla.org are publishing dozens of articles show[ing] what’s possible at the edges of web technology
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Firefox 3.5 implements all kinds of HTML5 and CSS3 features, many also implemented in Opera and Safari, so much of what they’ll cover is far from simply proof of concept.
Article are by folks at Mozilla and elsewhere, so there should be a very broad range of examples and ideas covered over the next month or so.


While we’re on the topic of the future:
There is a new and serious proposal for a web font file format on the table.
Relevant links, here:
The Proposal
New Web Fonts Proposal Discusson on Typophile
In-Depth Analysis: Apple and Microsoft In Talks On Web Font Protections