First of all great plugin, much appreciated!
Aside from minor quirks here and there, already listed in posts below, there's this one thing driving me mad every single time I have to migrate a site for a client.
You seem to store a lot of HTML in wp_options table, which is theoretically all fine, except for image paths. Is there any reason for hardcoding domain names there? Since it's all serialised, it's a pain to update when changing domains.