I spread mine out in a couple of places based on what the content is and how fast I need to get to it.
Articles and text documents that are important but not something I need to look up right away go into Evernote.
I put my notes from meetings and such things in Springpad and put all my files in Dropbox.
All are easily available wherever I am on my PC or Android phone.
Even though Springpad and Evernote do a lot of the same things I find it easier to take notes in Springpad which is why the separation is there. It's easy for me to find what I want because I know if it's a note from a class or a meeting, that's where it is.
If someone says remember the concept in the article that Bob Smith wrote, I know to go to Evernote.