This morning, HTC released the sourcecode to the T-Mobile myTouch 4G’s kernel. This doesn’t mean much to the average Android user, but to developers and modders it means that ROMs and tweaks can be developed to enable all sorts of customizations and optimizations.
Along with the myTouch 4G kernel, HTC also published a pair of “Maintenance Releases” for the T-Mobile G2 and Droid Incredible.
This isn’t the entire sourcecode for the device as some other news outlets are reporting, it’s just the kernel, not any proprietary, closed-source bits. Even still, it’s good news all around!
Source: HTC Developer Center