If you work at a magazine, or in PR, or have aspired to do so, you've probably checked out MediaBistro.com, the web site that's a must-read for industry professionals. Media Bistro was launched in 1999 as a bare bones networking site for journalists and PR people. The site has eveolved to become an indispensible industry tool and last week it was bought by Jupitermedia for $23 Million. Founder Laurel Touby will stay on as Vice President of the company.