I found two things that may be of interest to writers.
First up is Writer’s Cafe, which I found via Linux.com. It’s a multi-platform program that lets you organize just about everything having to do with your writing, ranging from outlining to collecting notes and reference material. I’m not big on this kind of thing because I don’t want to spend more time fiddling than writing, but if hyper-organization is your thing, give it a shot.
Second is the Visual Dictionary Online, which I found on Lifehacker. Because you can’t ask Google “What’s the name of that thing that connects to this other thing in a door lock?”, getting details right in a chunk of prose can get frustrating. With the Visual Dictionary, all you have to do is find a picture of the object in question and boom, you’ve got a word and a definition. Way cool.