FIXME: complete the list of features. change the order: most important features to the top of the list. prefix new features with "NEW". Integrated browser based configuration and control utility at http://config.privoxy.org/ (shortcut: http://p.p/). Browser-based tracing of rule and filter effects. Remote toggling. Blocking of annoying pop-up browser windows. HTTP/1.1 compliant (but not all optional 1.1 features are supported). Support for Perl Compatible Regular Expressions in the configuration files, and generally a more sophisticated and flexible configuration syntax over previous versions. GIF de-animation. Web page content filtering (removes banners based on size, invisible web-bugs, JavaScript and HTML annoyances, pop-ups, etc.) Bypass many click-tracking scripts (avoids script redirection). Multi-threaded (POSIX and native threads). Auto-detection and re-reading of config file changes. User-customizable HTML templates (e.g. 404 error page). Improved cookie management features (e.g. session based cookies). Improved signal handling, and a true daemon mode (Unix). Every feature now controllable on a per-site or per-location basis, configuration more powerful and versatile over-all. Many smaller new features added, limitations and bugs removed, and security holes fixed.