It's funny to see comments praising OneNote as the best thing since sliced bread...
Don't get me wrong, I like OneNote, and use it at work. But in a moment of snark I dug up a copy of Lotus Organizer 6 (from 1999) and installed it on my Win8 work machine. Lo and behold, I can keep notes in a multi-tabbed interface. I can format them all kinds of ways, add pictures, embed doc and ppt files, share the org file with other users, and generally do anything OneNote can do. I can keep a full calendar, manage contacts, track tasks, and keep linked notes. .. And then there are the things Organizer does that OneNote couldn't do... until v2013. In OneNote 2010, if you pasted in a table, you couldn't even select a column to format it -- OneNote mishandles it as line text. Track changes (which Organizer doesn't have at all) broke all the time in 2010 and doesn't survive more than a couple users in 2013; OneNote still totally trashes style data from other Office products, so you can't roundtrip text from a mildly complex word doc back into that doc without hosing the final. Embedding a ppt or xls table into OneNote would consistently get corrupted from editing collisions on a shared .one file. But Organizer would defer to the linked file and survive multi-user editing. Hah, funny.
Everything old is new again, with Redmond's fresh coat of pastels and waaaaay too much whitespace in the UI. Then again, these products are sinkholes for data -- from the latest .ONE file format back to the decade-plus-old .ORG-.OR6 file formats -- it's difficult to extract your stuff in usable ways when the format dies. Not that Microsoft, Google, IBM/Lotus, or other big companies would do that. Repeatedly. Predictably. Dependably. (E.g. Microsoft Office has trouble importing ... Microsoft Office files from 15 years ago, produced while working *at* Microsoft, FFS.) Tho it's much more limited to notes, Zim is really attractive in that regard: everything is saved in an open/documented non-binary format that'll be readable/recoverable when there's time to dig thru this crap when I'm old/near death.
Meanwhile in the real world, for just making notes and getting crap done quickly and effectively, the ubiquitous lab/moleskine/black notebook is the way to go.