I usually find three major uses of Dreamhost: Firstly (and importantly), as a backup dump, Secondly for SVN (Oops, not any more since I switched to github for good), Thirdly as cheap and slow hosting for mostly personal / hobby-network / friends sites. Contrary to people's complaints about Dreamhost, I find them extremely value providing (for shared hosting) for the money you pay them.

Now Drupal, as resource hungry as it is, is a pain on Dreamhost servers. I've had repeated painful experiences of the {menu_router} table getting half-rebuilt (or lesser) when I visit admin/build/modules before Dreamhost terminates the script for memory overconsumption, resulting in broken pages (and the annoyance of manually regenerating the table externally)

Assuming that the argument is a node ID, being sent (say from a panel, under most circumstances)

// grab nid from referring node
$args[0]=arg(1);
if(is_numeric(arg(1))){
$nid = arg(1); //node id
$term = taxonomy_node_get_terms_by_vocabulary($nid, 3); // 3 is the vid. Use your own Vocabualary ID!
$tids=key($term);
return $tids;
}

$args[1]=$tids;