[Guvante]

> You can still distribute your code under whatever license you want.

That actually isn't true.

> You must license the entire work, as a whole, under this License to anyone who comes into possession of a copy.

You are required to distribute it under GPL v3. I don't know enough legalese to determine if distributing the modifications alone as a parallel license is allowed.

[sp332]

This is only true if "your" code is a derivative of someone else's code. Putting code that's actually original into a project that also has GPL code in it doesn't mean you have to GPL your code.

Distributing binaries with mixed sources is where it gets hairy.

[cma]

A parallel license is allowed, if you remove any third party GPL'd code.