I've been thinking about some small programs I can create using stats from the bitcoin network. I was wondering if there is already a program that keeps track of the largest transaction that happened in a 24 hour period?
What is the largest transaction for you? Do you mean the transaction size or the amount of bitcoins which were sent? If the latter then
this page might be useful for you. It shows all transactions with the biggest amount of BTC sent in the past 24 hours.