A lot of folks are using the tmobile-g1 tag to refer to the "HTC G1" ... presumably because the phone has no HTC branding on it and the tag exists so it seems reasonable (that's why I used it ...) Seems like both tmobile-g1 and htc-dream should be merged under a single tag that follows the "manufacturer-model" format.
I don't have the reputation to suggest tag synonyms but this seems worth addressing?
Users with more than 1250 reputation and a total answer score of 5 or more on the tag, can suggest tag synonyms. Users with a total answer score of 5 or more, can vote for tag synonyms. Suggestions will be automatically approved when they reach a score of 4, and automatically deleted when they reach a score of -2.
I propose perhaps a community wiki here on meta to tease out all the poorly formed device tags and identify the correct tag they belong under.
Perhaps along the way we can do more re-tagging of posts with inappropriate device tags so that new users don't look around, see a lot of bad behavior and model their own posts after folks who are doing it wrong!