I use a combination of MS OneNote, Excel, and Beersmith. OneNote serves as the "notebook" where everything gets stored and organized. I keep different tabs for various styles, and then individual pages for each brew day.
On the brew day pages I insert a screenshot of the recipe from Beersmith, an excel file that contains the brew log, as well as a copy of the Bru N Water calculations and any other notes or photos I want to save.
The brew log is a multi-tab excel sheet that has tabs for the brew day, fermentation info, bottling day info, tasting notes, and then a "quick glance" summary of the overall process. So, it's a living document that gets added to right until the last beer from a batch gets consumed.
Onenote syncs to the cloud automatically (no file->save operations ever required), and I can pull up all of the same info using the app on my iPhone, including opening the embedded Excel spreadsheets. I don't know what I'd do without all of this, it's so handy. Attached pics show a page from the OneNote book on PC, the same page shown on the phone app, and a portion of the brew day tab of the brew log.