7. A method according to claim 1 , further comprising: calculating a metric for degree of relatedness between two words in said textual data set; receiving a user selection of a word; displaying said selected word in a color that contrasts with the default display color; and displaying all other words in the textual data set with coloration indicating the degree of relatedness between that each word and the selected word.
9. A method according to claim 7 further comprising: enabling a user to create a list of vectors in said n-dimensional data space each of which is associated with a color; recording a user selection of one or more vectors from said list; and changing the display color of each word in said word cloud to reflect its similarity to each of said selected vectors.