I just imported my old blog that dates back to 2005 trough the “Import RSS” plugin and I must say i’m impressed. The plugin created categories for the posts and event the images were imported.

All you have to do is: retrieve your old blog RSS 2.0 feed, save it some where, and let the plugin knows where it is by clicking the “Upload” button. The RSS import plugin is located under Tools->Import in the admin panel.