Alan (zzolo) and I have proposed two mapping sessions for DrupalCon London, please add comments if you have any suggestions, and vote if you would like to see the sessions happen:
Drupal 7 and Mapping
http://london2011.drupal.org/conference/sessions/drupal-7-and-mapping
Making Custom Maps with TileMill and Drupal
http://london2011.drupal.org/conference/sessions/making-custom-maps-tile...