[Jon]

There may have been a mis-edit in your categories.php.

As a "quick" fix, you can do this:

Open skin1/customer/home.tpl

FIND:

<title>

AFTER ADD:

{if $main eq "catalog" AND $cat eq ""}
YOUR CUSTOM TITLE HERE
{else}

FIND:

</title>

BEFORE ADD:

{/if}