OK that title is a bit provocative. I enjoy reading Slashdot as much as the next guy, and I'd always laughed at the comments about Slashdot readers being dumb, but this post got me rolling my eyes in frustration: "2 Displays and 2 Workspaces With Linux and X?"
The OP asks about buying a second monitor and setting up two screens - one large desktop or separate X screens. Firstly, I would expect a question like this from an Ubuntu noob, followed by lots of answers like RTFM, Google it, see this FAQ, etc.
However on Slashdot, there are so many people who still don't realise that one large desktop doesn't mean windows have to maximise to two screens. So few people seem to know about xinerama and yet they're still giving advice! Someone said that "Windows 7's easy dual monitor setup lets you maximise to one window - can Linux do that?" (sheesh, only for years now...)
Slashdot users have some fantastic, intersting, and informative posts. Unfortunately, unlike a regular email list where only the people who might actually know the answer reply, everybody on Slashdot wants to reply.
Quad Erat Rant-astrandum!