DownThemAll, Firefox's best download manager, now multi-lingual
If you currently use Firefox 3.6 and DTA 1.1, version 2 represents a massive and awesome overhaul to Firefox's best download manager. Speed limits (global, per server, and per download) are implemented; private browsing is supported; HTML5 video and audio tags are supported; the UI is cleaner, faster, ... and the list goes on. For more details, Lee covered most of the significant changes of DTA 2.0 back in May.
Download DownThemAll! 2.0 beta 5 for Firefox 3.5 to 4.0