On the more practical side, write down any idea you have no matter how crazy they sound or where you are (use your smartphone's Notes app). It will quickly become an habit and you'll soon find yourself with dozens of ideas. Eventually, the hard part will begin: choosing the right one.

Another good trick is to write down those ideas on your blog at a fixed interval. This has two side effects: it forces you to either execute on an idea or let it go and it gets you feedback from your visitors. Here's my most recent idea dump: http://syskall.com/some-crazy-and-not-so-crazy-startup-and-p...