Same here, Ping just when you change content, or sitemap you can use those free services to ping your blog pages and posts and your Sitemap XML. Ping Blog: pingler.com Ping sitemap XML: tools.pingates.com/sitemap/ Hope this will be helpful
Once you ping "search engines" your blog will usually remain on the sites. But you can ping additional blog specific sites when your blog is updated with a tool like BlogBuzzer