I get this tip from http://linuxlore.blogspot.com/2006/10/google-webmaster-tools-and-howto-add.html
The setting up of a Sitemap file for a Blogger/Blogspot.com is an easy thing to do. The question of what is a Sitemap file and why should I have one? is answered here
Prerequite:
(1) your site setup/verified in Google Webmaster Tools (more on that here my blog entry on that).
HOWTO:
(1) Login to Webmaster Tools (link)
(2) Click On the Add a Sitemap link
(3) Choose Add General Sitemap
(4) type in: *********.blogspot.com/rss.xml (your blog name for *********)
(5) Click on Add Sitemap button.
You are done! That is it. Simple.
After posting this I found that there is also an equivelant site at Yahoo - Yahoo Site Explorer It functions similarly and you could basically do the same thing over there.
