Wireless Arduino Uploads/Reloads (Best & Cheapest Options)

I ask a similar question back in the day (in the archives).

Just wondering as of now what is the best option to upload changes to our code wirelessly to your Arduino (mine is inside something which makes it hard to access).

take a look http://forum.arduino.cc/index.php/topic,199311.0.html working prototype referred.

It you use the Uno or Mega (but not Leonardo/Due), Adafruit just released a new bluetooth shield that allows you to upload the code via bluetooth: http://www.adafruit.com/products/1628