American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
Elsewhere on the web
LM: Even though I don't agree with the basic economic concept of all this stimulation, there is an excellent chance it will work in the sense of creating at least a boomlet-if not a full-scale boom, at least an improvement in the world's economic picture over the rest of this year.— Mineweb - Daily news headlines
Wasn't this latest "boomlet" significantly milder than the one on 3 / 18?— The Orange County Register - Homepage
In the last three years - ending quite abruptly this Fall - there was a hiring boomlet, with a cohort evenly divided between the fiftysomethings and the twentysomethings.— Confessions of a Community College Dean
So, facing a 79-seat deficit in the House, and an 18-seat deficit in the Senate, the GOP retirement boomlet is fated to continue. is now a year old.— Daily Kos
A rate drop could also spur somewhat of a "refi boomlet," in the next several months, Mr. Cutaia says.— Top Stories - Google News

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Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.