I regularly use org-mode, for all types of notes, including for work notes. One of the many advantages with org-mode is "time-stamping", and to have a reference

I regularly use org-mode, for all types of notes, including for work notes. One of the many advantages with org-mode is "time-stamping", and to have a reference to a particular item in your agenda (org-agenda). As e19293001 noted, time-clocking is also very nice, and the possibility to generate reports based on time spent on each item. Another very useful feature is the usage of internal or external links: links to local files, or to a external source such as a web links (e.g. through http, ftp, mailto, etc).