Having moved from Radio UserLand to Blogger many moons ago in order to simplify my life, I’ve now taken the opposite step, and migrated things over to WordPress. This will give me a lot more power to experiment with Semantic Blogging and what I’m referring to as ‘Thread Aggregation’ (pulling together discussion threads after-the-fact based on independent blog postings).
I am just posting a little aide-memoire concerning the conversion headaches in case I forget, and in case this helps others going through the same steps . . .
1. Be sure to see this Blogger to WordPress Migration (‘import Blogger’) Tutorial.
2. Beware ‘login loop’ if you get your directory structure wrong: The WordPress installation and the blog itself cannot be in so-called ‘sibling’ directories. In other words if your WordPress installation is in the directory ./wordpress/ and your blog is in the higher directory ./ then this is fine, as it would be if both were in the directory ./wordpress/ (i.e. same directory for each, which is the default. However, if the installation is in the directory, say, ./wordpress/ and the blog is in the directory, say, ./foo/ then this is very very bad, as it causes the login procedure to go into an endless loop . . . go figure . . . (thank heavens for this discussion thread describing the problem).
3. Exporting from Blogger and importing to WordPress:
a) be sure to set all output ftp paths rigorously, both for the main blog and the archives
b) be sure to set the date/time format rigorously before exporting from Blogger, notably “10/21/2004 04:15:58 PM” which is the TIME format!!! (the date is additionally set similarly to 10/21/2004 : don’t worry that it’s US-centric, it is trivial to re-set this after import… check out this discussion thread as a reminder.
c) the distributed ‘import-blogger.php’ may be superseded (check the date of the file) by an August 22, 2004 variant pointed to in this thread.
EisenBlog 2.0 
October 21, 2004 at 10:48 pm
Just a p.s. that also the ‘Template’ edit option (which defaults to editing the file index.php) is not 100% synchronized intuitively with the true location of index.php one level higher up in the directory structure, so I edit that one outside of the WordPress web environment.
October 25, 2004 at 6:05 am
The index.php that you can edit in the WordPress directory is for those who want their blog to reside in the same directory as their WP install. If you want your blog to be at your site root and WP in a subdir, it’s best to wipe the index.php in your WP directory and replace it with a redirect either to your site root, or to your /wp-admin/ folder, for your use only. You wouldn’t want to get confused and make edits on the wrong file.