Google is indexing your content.
It usually takes weeks for search engines to index content in a new blog and/or to re-index content under a new URL. What attracts search engines is unique content in posts (not pages) that cannot be found anywhere else on the internet. Start now publishing original content posts frequently two or even three times weekly. For more information read > http://onecoolsitebloggingtips.com/2010/01/21/omg-i-cant-find-my-blog-on-google/
To verify blog ownership of a WordPress.com blog with the major search engines you must use this process > http://en.support.wordpress.com/webmaster-tools/
Note: Even if you do not verify the blog the content will be indexed by search engines so don't feel panicky about this please.
Note also that WordPress.com automatically supplies sitemaps for our blogs to search engines - we do nothing. http://en.support.wordpress.com/sitemaps/#xml-sitemaps-for-search-engines
Lastly note that we cannot assist with search engine issues. They are between the blogger and the search engine. http://en.support.wordpress.com/search-engines/