I tried to find it, but couldn't.
I sometimes rely on my memory of text more then my numerous hotkeys, so in a workflow like "call a selected number on my iphone" I would love to have this workflow :
Select a phone number on a webpage
Launch Alfred with the default hotkey
Write "Call on iphone" and have the workflow pick up the selected text, and pass it as {query} onwards to my workflows
This could be so awesome!