Purging. Now what?

[Gaute Amundsen]

Now that I can trigger a purge when a customer presses "save" in our CMS, the 
next step is trying to do it somewhat smarter...

Purging everything from all hosts in the cache is simple via telnet, but a bit 
brutish. It could get noticable as well, with maybe 50 customers saving 
through the day..

Purging one url at a time is more presice, but then I have to keep track of 
what to purge. Finding all urls in a site is not very efficient, and 95% of 
those would not be in the cache  anyway.

I could build a small daemon to tail the access logs, and keep a running 
buffer of recently accessed pages. Then I could easily prefetch pages as 
well, after purging them. But it does not feel quite right this either...
Sort of buliding a shadow copy of varnish timeout mechanism.

Any good suggestions?

Regards 
Gaute Amundsen