As a learner who uses the web regularly for research – I could really use a web-scale related-words tag cloud service.

If you know of such a service, please leave a comment below! If there is no such service, i am going to go out on a limb and predict that it will be publicly available in the next year or so, say by, December 2009!

As an example of a Word Cloud, here is a word cloud created by makecloud.com of all words in the RSS feed of ReadWriteWeb:

Imagine if we could enter a keyword and then view a tag cloud of words from pages that contain the keyword. Related terms (synonyms, antonyms, sub topics, super topics) would be revealed because they are used together in documents on the web. If you know of such a service, please do post a comment!