Preview the contents of ZIP files before downloading with Archview for Firefox
Don't want to download a massive ZIP or RAR file just so you can extract one tiny file contained in the archive? ArchView is a Firefox add-on that will let you preview the contents of ZIP and RAR files posted online before you download them. And you can even download individual files from within the archive.
Archview hangs out in your status bar where you can click on it to enable or disable the plugin or change its settings. Future versions will add support for additional archive formats including ISO and 7z. Archview supports Firefox 2 and Firefox 3, but the version available at the official Firefox add-ons page claims that it isn't compatible with Firefox 3 beta 5 r Firefox 3 RC1. This isn't true, but you'll have to install the plugin from the developer's page if you're using anything newer than Firefox 3 beta 4.