I have discovered tons of interesting software - for Linux and other OSes - by reading Slashdot over the past years. People write in with "how do you solve this problem" and the others respond with software I never knew existed. I discovered Puppet this way, for example. I love this kind of article - not sure if others like them too. I'm also keen on the latest news on what KDE, Gnome etc. are doing - but I find people seem to be getting this information elsewhere these days, so maybe it's not a popular topic.