Ok, so today i was very impressed to discover this website.
This online tool lets both, designers and clients alike to do an easy intuitive test and preview of various fonts families on websites.
Better then this: you don’t have to do anything with the web code, just:
1. type in your website (or web page) address
2. choose the font you want to preview
3. preview the result REAL TIME
4. post the code into your CSS sheets to make it work.
Even though the website currently is in BETA mode — my congratulations to developers!