Can Install, But Doesn't Do Anything
I've installed and uninstalled both Zotero and Firefox 2 a few times today and am having the same problem: Zotero installs, adds its stuff to the "Tools" menu (and to the right-click menu), and I can get to the Zotero window, but that is it. No Zotero logo in my status bar, no icons in the location bar if I do searches (I tried JSTOR and Google Scholar), none of the buttons in the Zotero window do anything. My OS is Windows XP.
Edit: Never mind, somebody who knows what they're talking about beat me to the punch...