Google is eager to index your website or blog. How eager? Seems that they have created an API that unleashes the Google search spiders on your site. All you need to do is send Google an XML file.
Google Sitemaps is still in beta (aren't most Google tools) and it's very easy to use. The hardest part about using the service is creating the sitemap XML file. There is a simple tool available from Google.
If you create ASP.NET websites try out this new tool, Sitemap.NET, that generates Google Sitemaps from your website.
You've gotta like the price. Sitemap.NET is free.