Because Movable Type doesn't (currently) have an automatic by-Author Archives, I've implemented some tricks to make it work on the red kitchen. With group blogs, its really an important form of archiving. I just posted some of this stuff today on the MT forums, and thought I'd outline it over here as well.
Depending on the quantity of posts and number of authors that will be on the blog, this may change the number of Index Templates used. I'm gonna explain the using a single Index Template.
Create a new Index Template. I named mine Master Author Archives and have it publishing to authors.php. (.php because I'm using includes for the sidebars) I edit it each time I set up or remove an author. It has a snippit like this for each author (using myself as an example!):
<a name="kristine"></a>Kristine<br>
<MTEntries author="kristine"><a href="<$MTEntryLink>"><$MTEntryTitle$></a><br>
</MTEntries>
The bold kristine's are the 3 spots that need to be changed with each added author. I've also tried to be consistant with the author naming so that its easier to do this page – all lowercase and first name.
The page this generates is here.
Now, if you'd like to go further with this (which is why I added the <a name> portion of the above snippit), you can use this to direct link with each post to the archives for that author on the Main Index.
<a href="http://theredkitchen.net/authors.php#<$MTEntryAuthor$>">more posts</a>
You could also add a list of authors on the sidebar that links to each authors archives with a list like this – if you frequently add/remove authors, it might be easier to make this a module and include it on the pages that you want for the sidebar:
<a href="authors.php#kristine">Kristine</a>
<a href="authors.php#christine">Christine</a>
<a href="authors.php#robyn">Robyn</a>
etc…
I may add other tips to do with multiple authors onto this post, and if when questions come in, I'll do my best to answer them