One of the biggest differences between the Google Nexus One and the HTC Desire is that the latter comes with HTC Sense, but as predicted the homebrew ROM community has already addressed that. The Desire isn't even on shelves yet, but already there's a custom Nexus One ROM - albeit heavily in alpha stage - which adds Sense together with Flash 10.1 to the Google-branded smartphone.
There are a few drawbacks - the camera is locked at 3-megapixels, rather than its native 5, and can't shoot 720p HD video like the Desire - but things like the active noise cancelling microphones still work, even though that's absent on the Desire. Obviously you'll need to root your Nexus One, and there's the risk of a) bricking it and b) running into ongoing stability problems from an alpha build, but this is still likely to make a lot of Nexus One owners happy.
[via Redmond Pie]