1) Google Autocomplete - David Ferguson - Don't know
2) Weather - David Ferguson http://www.alfredforum.com/topic/193-weather-workflow-with-conditions-and-forecast/
3) Wolfram ALpha - Tyler Eich http://www.alfredforum.com/topic/655-wolframalpha-workflow/
4) Thoughts - Daniel Shannon http://alfred.daniel.sh
5) Disk Space - Florian Pellet http://www.alfredforum.com/topic/678-check-available-disk-space/
Also, I made a simple webs search shortcut for this forum, so I can constantly check out new workflows. A workflow to find new workflows would be pretty awesome.