Competition for Netsnippets & Onfolio (well, not really.. but it’s free!)
ScrapBook :: Mozilla Firefox Extension
ScrapBook is a Mozilla / Firefox extension, which helps you to save Web pages and easily manage collections. Key features are lightness, speed, accuracy and multi-language support. Major features are:

* Save Web page
* Save snippet of Web page
* Save linked Web page (Ver.0.13.0)
* Organize the collection in the same way as Bookmarks tree
* Full text search and quick filtering search of the collection
* Simple Editing of the collected Web page
* Text/HTML edit feature resembling Opera’s Notes