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This Python script will get your current sitemap.xml, then get all the category and product links for your Ecwid store, and merge them all into a new sitemap.xml.

Get the script from this gist on GitHub

This could improve the indexing of your site, and SEO.
Adding a Sitemap: http://my.site.com/sitemap.xml record to robots.txt tells crawlers where your sitemap is, which can help too.

The script can generate store page URLs using the regular "hash bang", clean or querystring style URLs

Edit the script and set the 4 constants to configure the script for your store.

Example usage from a linux terminal (create the file, then ssh copy it to the server):

python update_sitemap_ecwid.py > sitemap.xml
scp sitemap.xml my_server:mysite/public_html/sitemap.xml

Cheers!
Ian