I have been doing a technical diary in the form of an intranet blog for some time, and it works well for me. This allows me to record my daily activities, interesting links and project experience.
I find it useful that the blog engine makes it easy to search by tag, category, date or keyword, so even if you have several projects on the go, you can mark / catergorize them as you wish. In addition, by making the blog accessible to your employees, they will also be able to take advantage of your notes and even add comments and further suggestions.
There are many blog engines that are free / open source and extremely easy to set up (I use BlogEngine.Net with Windows Live Writer )
If you are not interested in the idea of โโother people seeing the blog, I recommend using Evernote , which is a wonderful utility note.
I think that the main thing is that you should make it as easy to use as possible, otherwise you will not be doing it for a very long time :)
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