<% if Tag %>
<title>$Tag Â» $MetaTitle Â» Your Site Name</title>
<% else %>
<title>$MetaTitle Â» Your Site Name</title>
<% end_if %> where $Tag will be replace with [yourtag]
Remains only the problem with subdomain and blog widget sidebar not working, all the links, from front, are returning "The requested page couldn't be found". Should I used the subsites module or do you have better idea ?