The MP article yesterday about indoor vs. outdoor cats brought up a lot of conversation about the issue. A few posters asked me about leash-training, so I thought I'd share this awesome how-to page.
The main issue I can stress is be patient. It took my cat a year to get the hang of it, and he still only uses a litter box. We go out for fresh air and some grass-nibbling only.
Hope this helps some of you or inspires you to try it!