Idea: a little Web-app or

Idea: a little Web-app or browser plug-in that follows me around while I’m surfing, caching pages along the way, either on my local machine or preferably somewhere on the Internet like X:drive (up to 100 Mb of online storage, free!), and then allowing me to search/sort those pages by keyword, date, domain, &c. That way, I’ll never lose track of those bits of information that seem insignificant at the time, but which are important at some point down the road.