Started 5 years ago next month.

Flight/hotel/car rental search, plus deals that I find for Australians.

Running it is actually fairly easy. It started as a deals site, then I added in some whitelabeled software, mailing list, fb page, and frankly it's a numbers game - more visitors = more ads/affiliate revenue.

It's not huge, but it's been interesting at least, and very little in the way of expenses.