Another user created an importer for them. There's a forum post about it "here":http://forums.obsidianportal.com/comments.php?DiscussionID=2089&page=1#Item_4. Eventually I'll even get around to updating the sheet to support more of the details his tool can provide, but for now at least it can fill in the major information for you.
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However, maybe someone can import the i4e files...?
It would make keeping/updating characters here so much easier and make OP even more complete.