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How do you manage your knowledge base?

Hello.

Now I am using easy writing pad for scratches while doing some researches, solving troubles or doing workarounds. But.. you now, it's really difficult to remember all details of founded solution and it's alternatives after few months. And writing pad is not wery useful. Usually writing pad doesn't contains half of needed inforation: links founded in internet, output of some test commands and etc.

Now I'am looking for a tool for storing information about my researches and it's results. Basic reqirements:

• ability to store files;
• ability to store formatted text (kind of HTML will be nice) with hyperlinks and code snippets;
• tags on notes;
• easy to use.

Now I'am thinking about some kind of file-system organized storage, but I think it will be inconvenient. Another thinks is local wiki or blog.

So, my question is:
How do you organize you knowlege base? What tools do you use, and what "pros and cons".