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I occasionally use Microsoft's Bing search engine. Coming up on the 1 year anniversary, I finally couldn't stand looking at the typographic travesty that is their logo. So I designed my own, and it's a solid, aesthetic replacement, if perhaps a bit bland.
I put together this GreaseMonkey script that replaces the logo (and favicon) on bing.com and discoverbing.com. I hope you find it useful.