Inspired by the Glyphicon set that comes with Twitter Bootstrap 2.0, Font Awesome is designed from scratch for a full array of web-related actions.

Map Icons Collection is a set of more than 600 free icons to use as placemarks for your POI (Point of Interests) locations on your maps. You can use them on Google Maps with the "My places / My maps" feature or automatically by using the Google Maps API.

When I open up Reeder on my iPad I am always reminded by how many websites do not have a WebClip Bookmark Icon.

If you are looking for that perfect icon for your web site, blog, web app or application, you will find them here.
Below is a compilation of the best ever Web Design and Development Icon Sets.
Please note, this list has no ranking.