I found CoWorkersAds.cim to be a very interesting and neat concept. It is a very good tool if you want to post a classified ad. The whole website is basically like craigslist.org, but the difference is that you are dealing with people within your company. For example, if you work for oracle, you can go on CoWorkersAds and search classified ad postings from employees within Oracle. After taking a close look at this site, I have come to the conclusion that it is probably safer than a site like craigslist because you are dealing with people you know, people within the organization you work for. I would recommend checking it out! The only drawback I have is that you are posting or viewing classified ads form a limited community, because it all depends on how many people from your company participate in CoWorkersAds.