High Scalability Building bigger, faster, more reliable websites.

Recently I had to help users on one of my opensource project ISPMan. http://ispman.net
This project started in 2001 as I was too unwilling to take care of the DNS and VitualHosting stuff as it was a side-thing to the company I worked for (so i wrote a software that took care of all these little details)

Summary: A large project that needs a rewrite can be done in a matter of day.
I will not give you a full case study about a project that went through a re-write but a case study about how easy it is to re-write something.