I need a good software notebook. It has to work on several computers at the same time (and ideally across different operating systems, though Linux alone is enough for now). I want synchronization over the internet and a convenient interface. Don’t suggest Google Docs.
What do advanced folks use as a repository for information that is needed right now, was needed at some point in the past, or will be needed later? With grouping by contexts (or projects, or tags) and dates?