How Do You Fool Spam Bots?

ThisIsAnExampleAccou asks: "I am currently researching Spam Bots, and the various methods by which they collect addresses. While doing my research, I have started to notice the various ways that people post their email addresses to fool spam filters (i.e. bob@hottroutmail.com - go fishing to mail me) What clever ways have you seen/done to fool spambots while still letting people know how to get in contact with you?"