Evernote
Evernote is a great application. I use it to store all my reference material for work. The searching is great and its very easy to sort data into various Notebooks. I highly recommend the application.
There is one functionality that would make the application even better: keep the color syntax when I paste in text. I paste a lot of code from Visual Studio and Microsoft SQL and it would be much easier to read the text if the color syntax was still in place when I paste in the text.