HTML/JS prototype we've created for a mobile toolbar and dashboard for Drupal that we hope to include as part of the Spark distribution and then propose for Drupal 8 core as part of the Drupal 8 Mobile Initiaitve.
Drupal 7's default administration tools (e.g. Toolbar module and Shortcut module) were not designed in a “mobile first" way, and as such can be difficult to work with on tablets or smartphones.