I've done interviews where I was asked to come prepared to present some code I'd written (either a homework problem or some open-source work). I found it a nice

I've done interviews where I was asked to come prepared to present some code I'd written (either a homework problem or some open-source work). I found it a nice approach: they got to see how I'd explain code to a colleague and what aspects I focused on. I could take time to tailor my presentation to the company if there were things I thought they'd find more important. The downsides are that it's harder on people who don't like to put on a performance and it's harder to come up with objective-seeming measures between candidates.