If there is "&" in the names of the categories, the category URL won't work.
For example, the category's name is "Bonnie&Clyde", the URL will be
http://servername/blogsite/archive/tag/Bonnie&Clyde/default.aspx". It shows "Page cannot be found".
In default MOSS blog site, the URL will show as http://servername/blogsite/Lists/Categories/Category.aspx?Name=Bonnie%26Clyde
A little bug in the ebe:createTagUrl(Title) maybe.
Thank you for all the efforts to make the awesome blog templates!! It rocks!