A couple thought-provokers from Trent at The Simple Dollar caught my attention, but his review of Fantastic Contraption was well worth it. If you loved The Incredible Machine game, you will really dig this free version online. Easy to set up, but gets really, really hard!
Check out these other two posts: Living on Half Your Income: Could You Do It? and The Expenses of a Soda Pop Addiction – And How to Defeat It.