Second group in mini profile

This can be done with a Template Mod, rather than a plugin.

Head to your Mini-Profile Template (Admin Panel -> Themes -> Layout Templates -> Mini-Profile). The first few lines should look something like this;

<div class="$[miniprofile_class]">
$[user]<br />
{if $[user.is_guest]}Guest<br />{/if}
{if $[user.group]}
$[user.group.name]<br />$[user.group.stars]<br />
{elseif $[user.rank]}
$[user.rank.name]<br />
{if $[user.rank.stars]}
$[user.rank.stars]<br />
{/if}
{/if}

Try changing it to this for me;

<div class="$[miniprofile_class]">
$[user]<br />
{if $[user.is_guest]}Guest<br />{/if}
{if $[user.group]}
$[user.group.name]<br />$[user.group.stars]<br />
{/if}
{if $[user.rank]}
$[user.rank.name]<br />
{if $[user.rank.stars]}
$[user.rank.stars]<br />
{/if}
{/if}

That will make the Mini-Profile show like this;

MEMBER'S NAME
USER GROUP
USER GROUP STARS
POSTING RANK
POSTING RANK STARS

I think this is what you're wanting, no?
If so, you can of course have a play with the layout and formatting, so that it sits how you like. =]

thank you. I really like it.