It's easy as hell to forget about cross-browser testing -- we do, after all, serve our pages as proper XHTML, which only works in a select number of browsers, anyway -- but we've at least made a cursory attempt to ensure that this site looks and works as expected in your browser of choice. Dave Shea's recent browser report, inspired by the return of thecounter.com's long-running browser summary, is an updated look at which browsers to support and why. Good stuff, indeed.
Postscript
Some navel-gazing reveals what we've long expected: more of our visitors use Mozilla or Firebird than use any version of Internet Explorer or Netscape. In no way representative of general browser trends, but encouraging, nonetheless.