We do this periodically on my exercise video board (waves *hi* to any Vfers who followed me here, I know there are some of you!) when people find they have a lot of stockpiled stuff they haven't done yet. Basically, you resolve not to buy anything for a certain duration, and you check in periodically to report on now you are doing and get support when you are faced with temptation
I will be doing a no-buying challenge for November (have Nanowrimo going on!) and possibly until the new year. I have plenty to read right now and really want to enjoy some of it before I get anything else. So, who else is in? Anybody want to join me for a formal challenge here?