For a recent project, I wanted something fancier than a regular HTML text area to allow user input with formatting. "Something like the editor on Blogger", I thought.
After hitting Google, I ran across FCKeditor. I had heard of it before, and even played with the demo once, but never did anything with it. Never had much of a reason to. Today that all changed.
After reading through the Developers Guide, I downloaded the ZIP, unpacked into my public web directory, and had it working in no time. In less than 30 minutes, I had the FCKeditor completely tied into an existing Rails form, replacing a boring old text area. After a few minutes of testing inserts and updates, and some cross-browser testing with Firefox and Internet Exploiter, I was happy.
Overall, I was pleasantly surprised. Unlike a lot of open source projects out there, this was extremely easy to get started with, easy to install and embed into existing applications, and the documentation was pretty good for a change. The quality so far has also been nothing short of impressive. (the editor is more full-featured than the one Blogger uses.)
This project today was just a personal side project, but I think FCKeditor might find it's way into my arsenal for work projects as well.