Zotero is the best tool for capturing web pages, videos and blog sites. They have a great 3-minute introduction here. It works best with Firefox, but is compatible with any browser.
Zotero lets you easily import citations right from your browser. It allows you to cite these sources in Microsoft Word and other word processing programs.
Here's a quick peek from the librarians at Wake Forest showing just how easy it is to use:
Getting Started With Zotero, from Idaho State University Libraries: