T-Mobile, for some reason (we bet they signed something), evidently insists on making Google the default search engine for their phones, including the HTC HD7. It's sort of annoying for many because Bing is actually really good at what it does.
In the Mango update for the HD7 for T-Mobile (in the US at least), users have an extra option under the IE9 settings--basically they get to choose Google as default or switch to Bing, which is migh-tee nice of them, no? Of course, you're probably wondering why the rest of us don't have that option to go in reverse, right? Yeah, we don't know either.
But at least for T-Mo users, feel free to switch back to Bing now and take a shower to wash the ick off. Thanks, Prakash G., for the tip and photo!