I use it a lot for all my note taking needs. I use notes all the time for work for things like store lists and note when I am doing a quote on a job. Having it instantly saved to skydrive really helps me. I also use it like a personal diary for some of the crazy thoughts that pass through my brain. It get bazaar in there some times.
I use OneNote primarily for school. It is amazing to be able to copy and paste important information from websites for my research when trying to write an essay. It is also really good for studying material for a test.
For a lot of stuff. Currently working on my bachelors term, so I for example take notes there of books I find or pages within the books that could be relevant or just write down thoughts I get on the run on what I could type so that I dont forgot. Sometimes I also use it as a to-do list.
Well.. I just use it for a lot of stuff that involves some kind of taking notes. It's so nice when it's synced across all my devices. It's great to also be able to easily add in screen captures for example.
All of my project documentation are done in OneNote, as well as quick notes for things to remember.
in school I used a Thinkpad X61T with OneNote and took all of my notes on that, it was great writing directly on power points and PDFs and I could record the lecture audio and searching my handwritten notes would take me directly to that point in the audio. Very very powerful software.
I use it for everything! Work Projects, diaries, manuals, task lists and meeting notes. It feels great to be able to off load my thoughts onto OneNote. For those with busy lifes, I highly recommend a concept called Getting Things Done which is a way to organize projects, big and small in your life. Combined with OneNote on windows phone and on a windows desktop, its a complete life changer.
I'm hoping the OneNote app for Android supports the dual-digitizer stylus input as found on the HTC Flyer. That would be a godsend for me. Especially in my classes. Otherwise I'm stuck with the Notes app provided by HTC (which isn't too shabby tbh, I used it a LOT during my final year project, it was very good for me, kept everything together)