Trivia: What percentage of google queries consist of concatenated words, like 2007kentuckyderby?
Answer: I don't know, but they show up periodically as keywords in google queries pointing to my site. This has to drive the query engineers nuts, right?
Basically, some people don't know how to use google, so they just type in everything they're looking for and concatenate it into one word for every query (yes, people do this, I see it in my logs, and Eszter Hargittai says they do). Were that the only problem, the query engineer just would have written a nice probabilistic word exploder to transform "kentuckyderby" into "kentucky derby" and gone home. They can't though, because this breaks a search for the userid "kentuckyderbyfan" which would get exploded into "kentucky derby fan", losing google's lovely specificity.
I figure I ought to help google out a bit and hook my blog code to catch a google referral and insert a leading div that tells the person how to use google, so if you check out the query for 2007kentuckyderby, you'll see this in action. Otherwise, google just has to hope that user will sign up for gmail and then google will be able to look at their query stream and go, "Oh right, you're one of those people."