The Seattlest blog links to an announcement from Craigslist that the online classifieds site will start charging for employment ads in Seattle, San Diego, Boston and Washington D.C. later this month.

Part of the reason, according to Craigslist, is the incredible amount of spam, fraudulent schemes and overposting on the job boards for those cities. Ads for odd jobs and small projects will remain free.

Job postings will cost a $25 flat fee.