Evernote is an excellent note taking application which has a version for just about every operating system except for Linux. Luckily, there's a third party tool that works like Evernote and synchronizes with your Evernote accounts, and it runs on Linux.
We are all aware that storing data in the cloud has its own advantages, making our data available everywhere we go. But storing our personal data on someone else’s server might lead to concerns about privacy. Check out the recently released ownCloud 3, which lets you host your data on your own server.