Migrating from Wordpress to Blogger is not a simple, straight-forward dance.
If you read the Blogger help groups, you will be told that all you need to do is export your blog in Wordpress as an XML file, and import it. Easy as Waltz.
If you try this, however, you will realise that Wordpress uses a non-standard XML format, which Blogger doesn’t read. They each dance to their own beat.
So, a converter is suggested, but no mention is made of one. Anywhere.
Finally, while searching for a method to export my Live Spaces blog to XML (a feature that is remarkable lacking from the otherwise wonderful Live Spaces service), I came across the lifesaver. The universal dance chart of blog conversions: Blog2Blog.
Do not let the Linux header put you off. Blog2Blog is a .Net application (which means it will run on all Windows platforms, provided they have been updated with at least the .Net framework 2) and is super-simple to use.
You can use it to retrieve your blog entries from Livejournal (or compatible), Blogger or Wordpress, and then publish them to Blogger, Livejournal (or compatible), Live Spaces or Wordpress.
Just a note: if you do migrate to Blogger, note that Blogger has a 50 post per day limit, so if you have more than 50 posts to import, you will need to do it in batches.