Well, they are barely here. The bleeding edge of browsers today would have to be the impending release of Firefox 18.104.22.168. According to the wiki at Mozilla's site, today was the tenative release date. There's a quick summary in the Mozillazine blog covering the changes in Thunderbird, and if you browse bugzilla you can see a host of fixes in store for us. You can currently download both Firefox and Thunderbird's newest versions from Mozilla's public ftp site, though as of this moment they haven't added 22.214.171.124 to the main page. Originally scheduled for a release last week, it was delayed for development, but is now here (if you snag it yourself) and public very soon.