Formatting problem

Q: No matter what I do, blogger always posts my blog post with too many spaces in between paragraphs. Suggestions?
A: Edit your post. In the post editor select all your text (highlight). Hit the Tx icon on your tool bar (2nd last from the right). This will remove all formatting. 

Re-format manually. Publish post.

source: http://www.google.com/support/forum/p/blogger/thread?fid=42034000eba67e270004a7c18f0ddbfb&hl=en