Font Organization

I know I have seen this posted before, and I'm sure if the memories worked I would be able to find it there as well, but here is my question...

What is the best way to organize your fonts, and how can you install and uninstall as needed?

I've got a bunch already, and have an itch to get some more, but as I've read it can slow down your computer etc.

Thanks guys! You are super helpful, and hopefully I'll be able to answer some questions for others