Well, the WordPress importer is kinda flawed, but as a developer I use it quite often. One of the more annoying things is that you can't simply import a file that's on the server. This plugin makes this possible. Please make a full backup of your WordPress install before attemting such an import.
Another feature is the auto-import of files during the plugin activation. This is especially useful in combination with the WordPress Reset plugin. Just reset the blog and auto-import all the content you need. Right now you'll need my patched version of the reset plugin that you can download from the plugin page on my site.
More recommended developer tools:
Here is the WordPress Importer Extended wordpress plugin download link you can download and install to your Wordpress blog
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