varnish 2.0.4-2 (i386 binary) in ubuntu karmic

 Varnish is a state-of-the-art, high-performance HTTP accelerator. It uses the
 advanced features in Linux 2.6, FreeBSD 6/7 and Solaris 10 to achieve its high
 performance.
 .
 Some of the features include:
  * A modern design
  * VCL - a very flexible configuration language
  * Load balancing with health checking of backends
  * Partial support for ESI - Edge Side Includes
  * URL rewriting
  * Graceful handling of "dead" backends