As reported by Scoble: http://friendfeed.com/scobleizer/01bbb409/i-love-that-bing-means-is-not-google-very
I agree — very clever and quite funny. A recursion that all computer scientists should appreciate, tipping its hat to similarly-constructed acronyms, such as GNU (Gnu’s Not Unix) and Pine (Pine is not Elm).
It’s interesting, too, how the new generation references the older generation, i.e. the final character in Bing is the G. Lest we forget, the very first Google logo had an exclamation point at the end — a not-so-subtle reference to Yahoo!