Can someone elaborate more on product advice from YC (an example would be sweet)? We heard some advice from the Digg/flickr guys and they said that it doesn't

Can someone elaborate more on product advice from YC (an example would be sweet)? We heard some advice from the Digg/flickr guys and they said that it doesn't really matter what you write it in (just as long as code is manageable and your interface usable), just get it out there, and then iterate and optimize (because you'll have to change things later anyway).