This is a fantastic font that has become my go-to for web projects. It's variable width, so one file gives you all the bold, semi, thin, black variations, etc.

This is a fantastic font that has become my go-to for web projects. It's variable width, so one file gives you all the bold, semi, thin, black variations, etc. Also lots of cool glyphs, old style numerals, ligatures, etc and it's specifically designed for web readability. And free and open source!