Downloadable computer software for selecting individual content items and groups of content items from Internet web pages, downloadable computer software for creating, saving and retrieving definitions of content items selected from Internet web pages, downloadable computer software for creating and associating text labels to definitions of content items selected from Internet web pages, and downloadable computer software for displaying individual content items and groups of content items selected from Internet web pages

On-line computer services for retrieving and serving definitions of content items selected by users from Internet web pages, on-line computer services for creating and associating text labels with definitions of content items selected by users from Internet web pages, on-line computer services for using text labels to search stored definitions of content items selected by users from Internet web pages, and on-line computer services for serving results of searches of stored definitions of content items selected by users from Internet web pages