I think this simple informations (but very useful) should know every blogger.

Full site feed:

Atom 1.0: http://yourblog.blogspot.com/feeds/posts/default

RSS 2.0: http://yourblog.blogspot.com/feeds/posts/default?alt=rss

Comments-only feed:

Atom 1.0: http://yourblog.blogspot.com/feeds/comments/default

RSS 2.0: http://yourblog.blogspot.com/feeds/comments/default?alt=rss

Label-specific site feed:

Atom 1.0: http://yourblog.blogspot.com/feeds/posts/default/-/labelname

RSS 2.0: http://yourblog.blogspot.com/feeds/posts/default?alt=rss/-/labelname

Individual post comment feed:

Atom 1.0: http://yourblog.blogspot.com/feeds/postId/comments/default

RSS 2.0: http://yourblog.blogspot.com/feeds/postId/comments/default?alt=rss

Resource :
Blogger Help :http://help.blogger.com/bin/answer.py?hl=en&answer=97933