Spamology

Spamology is an interactive website environment which uses audiovisual representations of word frequencies in spam e-mail messages. Its creators have collected data from over 2,000,000 emails originating from all over the world over the past 10 years (1997-2008). The higher the stack, the more frequent the use of the 'spammy' word.

You'd think common spammy words such as Viagra, FREE, or CIALIS would have the largest stacks (and undoubtedly, they are VERY high stacks), but its common words such as "with" or "but" that have the highest stack sizes.