I made this tool in my spare time to help speed up the craigslist posting process. Currently it only links to computers & tech sections of New york city, san francisco and los angeles. If people like the idea, I'll give it more features.
You need a google docs account to create a spreadsheet that will store variants of titles & descriptions and usernames. If more explanation is needed, just post.
CraigsAssistant - Craigslist Posting Tool 
