<$mt:EntriesCount$>
Returns the count of a list of entries that are currently in context (ie: used in an archive template, or inside an Entries tag). If no entry list context exists, it will fallback to the list that would be selected for a generic Entries tag (respecting number of days or entries configured to publish on the blog's main index template).

liberal art
February 20, 2008 4:16 AM | Reply
this tag works within context of an narrowed entries container, i.e. ...
The short description seems to suggest that it will only count entries in a particular BlogID or at least that's how I misread it...
Gautam Patel
September 17, 2009 4:56 AM | Reply
All counts take the following additional (undocumented) attributes:
Where sometext is whatever you want.
Thus, this could be:
and it will say "1 entry", "2 entries" (or whatever number of entries it finds) or "No entries"
Mihai Bocsaru
November 10, 2009 12:27 PM | Reply
Unfortunately this tag doesn't work correctly when provided inside an mt:Author loop on an Index Template, though it works inside an Author Archive Template.
I'm going to open a Bug case for this!