I just created an automated method to produce Google sitemaps for LiveWebShop.com , hopefully it'll help Google learn about new pages a little easier. I'm scared that I actually have more pages in my site, then in my sitemap. I'd hate for Google to stop crawling my site in the traditional way and only rely on the sitemap.
In anycase, I'm using the method that Google has suggested on their site. I'm excited to see what if any benefit it'll give me. I just put in a new Automotive store on the site, so I want all of those product pages to get picked up as quickly as possible. I'll let you know if it worked as designed. So fax my indexing is comming along really good, got about 36,600 pages indexed so far. Only a few million more to go.