Many of you will be familiar with Font Finder, one of my first Firefox Extensions. The purpose of Font Finder was to display information about the selected font within your browser including information like size, line-height, color, etc. It also went further by not only showing you the font-family stack, but also determining which one was actively being rendered on your machine (as the font you see might be different to other users depending on your installed fonts).
I'm happy to announce that as of today, Font Finder is now available as a Safari 5 Extension. It has also been updated to be fully compatible with Firefox 4. I'm not planning on building it for any other browsers (e.g. IE9, Chrome) but if you have any suggestions for improvements to either version, please get in touch.
This is just the first step in porting Font Finder to Safari 5 and I will shortly be releasing an update which makes full use of the Safari UI rather than containing everything within an alert box - I will also be adding a lot more information, particularly around CSS 3.