It's also a pleasing experience when you go back t o extend functionality, think to yourself "Now why didn't the developer provide this API functionality?" and soon after discover that he not only did, but also provided the functionality you were working on. Even nicer when it happens over a 5 year timespan.

Does anyone believe Britney has any actual talent outside of shaking her ass?

And that's precisely what makes her an artist and not a musicician.
Which I actually believe is the bigger issue here. If someone can't sing, can't write, can't play, but can shake his/her ass and generally take the life of being an artist (not saying Britney can though), let's call them an artist.
However, let's not confuse them with the persons who are actually making the music.

Or how about Lucasarts' Habitat for even more prior art?

Nope, they remade Solitaire for the Vista versions that includes it.