Three part longish question to explore the scope of Perl's power. Since there are so many heavy-hitters here, this, I hope, should get some very interesting info.

• What is the largest system|code|site you have (>=90% of the work was your own) supported|created|inherited which was primarily in Perl?
• What are the main strategies|techniques|modules|brands-of-coffee that allowed you to pull it off (how about a bulleted list)?
• What was the single biggest mistake (most costly to your own time) you made while doing it?

Thanks!

Addition: Excellent stuff so far! Keep it coming. I'll see about doing a précis of the replies when the thread has died down.