It's been documented that CL is overtaking the eBay monster... so if you want to get on the gravy train, you need to be at platform Craigslist.
Post, post and post some more... I found a guy who was using my tactics but offered a service to me to post and I only pay for posts that stick... only 10c each post.
To give you some idea it was taking me between 1-2 hours per day, to post 100 ads, now it only costs me $10! I've been doing this for the past 2 weeks and my sales have increased from an average of 23 sales per day to 39 per day - 7 days per week. : For a $19.99 product ($19.89 is profit...)