I found a way to import all of the old entries, but it doesn't bring the comments (which for me wasn't neccessary).
All you have to do is setup an RSS feed in the Pmachine RSS factory to export all of your entries. Unfortunatly it has a 2 digit limit so if you have more than 99 posts you have to go into the MySQL table manually (called rss_factory if my memory serves me right) and manually change the number to more than the number of posts you had in your old site (5000 did the job for me). Then create a new dummy entry and the RSS will be generated. Save the RSS to your computer.
Once you've done that just use the import RSS feature in wordpress and the rest is easy peasy. I had a bit of a problem with it timing out due to sandboxing on my hosts server, but if that happens just remove any entries in the RSS file that have already been imported and start again.
One last thing... the importer puts all of the entries into your 'default' category so you might have to manually update the categories on each post.