Here's a very handy tip for fixing the "directory does not exist" profile picture problem in Drupal.

Fix Drupal Profile Picture Problem

Useful site for formatting sitemaps, handy for submitting sitemaps to Google

http://www.sitemaps.org/protocol.php

Also there's a Drupal Module for creating automatic Sitemaps that update to google everytime you update the site. However this is not quite ready for Drupal 6 yet.

http://drupal.org/project/xmlsitemap

A very handy Module for Drupal, it allows you to add a more advanced contact us for then the default Drupal Module.