EVERNOTE is one of the most accessed apps in my Macbook right now. It's such a simple concept but very useful. The ideas, notes, blogs and nonsense I write on my laptop (categorized in different virtual notebooks), gets synched to my iPad and iPhone (I know, I know I'm an Apple whore), so I can get back to my stuff wherever I go. It gets synched when you're on the Internet, and you can read locally on any of your devices. You can use rich text format on your note if you want to get a little creative. You can download it for free, but if you want to upload up to 1 GB of files to your notes or collaborate with other users, get ready to shell out $5 a month. I'm still using the free version since I don't really upload large images on my notes.