If you use Microsoft Office and you aren't a OneNote user, you need to go right now and see how excellent it is, then come back.
Are you back? Good.
Right, now that you've seen how good it can be on the desktop, just think how good it would be if you could have your OneNote notebooks with you anywhere, synced via the cloud to your smartphone or tablet, and even accessible and editable in a web browser...
Well if you make sure that you actually store your OneNote notebooks on a free SkyDrive account then you could already sync them between OneNote on multiple desktops, your Windows Phone, iPhone or iPad, and even share them with friends/family/colleages as appropriate.
Now the last big missing piece of the jigsaw has been released by Microsoft with OneNote Mobile for Android.
The feature list looks like it features pretty much everything that you'd need for note-taking on the move. If you're rocking an Android device, go get it now (yes, even if you're an Evernote user - Evernote is great, but you should definitely compare and contrast OneNote - to my mind it's a nicer way to work).
* Blackberry users, I'm sorry but there's no good news for you. I'm not just referring to OneNote there. There's just no good news for you generally.