In the podcast, you referred to using Flickr instead of the built-in WordPress gallery because the former offers better features. While that might be the case, you should consider the latter because of search.

At WordCamp Dallas 2008, John Pozadzides explained in his presentation that it's better to host the files on your site. Otherwise, when users perform Google searches against your photos, they will be directed to the static Flickr page link instead of the page on your blog which might be using the picture.