A simple OS X service to query Wolfram Alpha. When you right click on some text and hit 'Wolfram Alpha,' the text will be replaced with the output of a Wolfram Alpha query.
This works by creating a OS X service using Automator. To create a service, open Automator and choose service. Change the action to "Run Shell Script" and set "Pass input:" to "as arguments." Also, select "Output replaces selected text." Then simply copy the following line into the field.
python /path/to/repo/wolfram.py "$*"
You can save it as Wolfram Alpha or whatever you want.
That's all you need for easy Wolfram Alpha queries!