ACME realizes that there isn't a whole lot of reason to have chat, but they think it would be cool to give their manufacturers some place to come and talk about widgets. In fact, they want to be the place on the Web for the active discussion of widgets. One of their employees found a site that has free scripts (WWWBoard at Matt's script archive). They simply want their developer to download this Perl script, configure it, and get it running.
Investments 'R' Us wants to use their chat system to allow their representatives on the road to communicate with each other. They don't want to have to keep up a public chat system, so they need to have this password protected at least. One conversation thread at a time is enough.
Blockmonster wants to keep pushing the envelope on their site. They want you to develop a java-based chat system where people can start their own areas if they need, have private areas, link to pictures with their posts -- the works. And they want a nice front end to make it simple. They are willing to buy another server just for it (babble.blockmonster.com) so that it can get hammered by 80s-retro fans excited that Culture Club is going to tour this summer.