When is the best time to submit a sitemap?

[MichaelWeisbaum]

What changes to a website constitute resubmitting a sitemap?  For example, if I add new in-site links, should I then resubmit?  Or is it more for changes to URLs, Page titles, etc?

[RyanKent]

In my opinion the best solution is to automate the process. For any site with user generated content or where content is being added frequently, I set up a CRON job to create and submit a sitemap daily. It really is a one time, set it and forget it type of thing.