Note: I am hosting a BoF at DrupalCon London about this: Join us in Room 333 on Thursday 25th August from 11:00 - 12:00 (second half).
Varnish and Boost are normally seen as one-or-the-other. However this does not need to be the case. This article introduces a configuration which allows any site running Boost to run Varnish additionally and make the site both much faster and much more scalable. It also allows you to make use of Boost's advanced expiration features (until the expire module is finished) and combine this with Varnish. I'll show an easy howto method for adding Varnish, and - for those being more experienced in VCL - why this works the way it does.