Given the size of the sitemaps, two useful future features per sitemaps.org would include:
* gzipping the generated sitemap files (and linking accordingly from the sitemap index)
* using the <lastmod> property at the sitemap file level
These are a little trickier (more dependencies for the gzipping, and adhering to the spirit of the lastmod for sitemap files), so I'm not going to tackle them right now.
Given the size of the sitemaps, two useful future features per sitemaps.org would include:
* gzipping the generated sitemap files (and linking accordingly from the sitemap index)
* using the <lastmod> property at the sitemap file level
These are a little trickier (more dependencies for the gzipping, and adhering to the spirit of the lastmod for sitemap files), so I'm not going to tackle them right now.