Accessible Search Engine
Without a doubt, my favorite online learning tool is Google where I can generally find answers to just about whatever real world problem I happen to be facing at any given time. I’m not sure how accessible Google and other major search engines are (or aren’t) but I just came across YouSearched which bills itself as The Accessible Search. I would doubt that the quality of search results is as high as the big players, but some of the features may be nice for certain situations.
Good point Francesco– the point that the website is only accessible to English speakers is a good one, perhaps you should write the developers to encourage them to add support for non-english sites.