Historious lets you easily recall where you browsed, but the price tag is a killer
Historious tries to fill an incredibly tiny niche in the world of online bookmarking, archiving, and saving text for later perusal.
It's a browser bookmarklet, and its claim to fame is that it involves just a single click. There's no tagging or anything like that. Once you click the bookmarklet, Historious adds the site to your "personal history." You can then search your personal history for anything in the text of the article that you wanted to read. The search engine that's used seems to be a rebranded version of Google Custom Search.
Let's say that you've read an article about honey bees, and months later, you think to yourself, Hmm, where was that article about the bees? You can just go to Historious, search for bees, and voila – there's your article.
The reason that I feel Historious has a very slim chance of making it big time is that they want money. I mean, there's nothing wrong with wanting some money, but their business model makes it a paid service.
Delicious, Diigo, Read It Later, Instapaper and Google Web History are all services that could be used for doing much the same thing; they provide richer functionality and are completely free. Most of these won't let you search the entire text of the page, though (with the exception of Web History, which is a bit creepy in its own way). But, that aside, I am just not convinced that being able to save my pages without tagging them first is worth US$19.85 per year (they do offer a free option, but it's just up to 1,000 links).