That's what this site is all about - at least for the most part.
This Wiki has been here for more than 10 years. I just added a blog to Tobanet.de, so the Wiki comes second now.
But it is still serving it's purpose:
it is one of two places where I publish documentation regarding the IT-stuff I do every day as a sysadmin. And because this primarily means dealing with Linux (especially my favorite distribution Debian) and the essential software packages one runs on top of that (like apache, mysql, samba, …) most part of my wiki consists of Linux stuff.
I organized my IT docs with tags (see tag cloud on the left) and tried to fit everything to categories where possible. The main categories have their own entry in the navigation bar. And nonetheless you can use the search box and try your luck …
the homepage of our parish I maintain as the webmaster.