Send sensor data (DHT11 & BMP180) to ThingSpeak with an Arduino

Thingspeak -nevermind how easy to set up- has a few hurdles that I ran into and that, judging from reactions, other people are struggling with as well.

Things you need:
Arduino
W5100 EthernetShield (if you have the old ENC28J60 ethercard, look here)
Thingspeak Account
Sensors (such as DHT11 and BMP180)
Internet connection

Solution
You will find a better program to start from right here:

https://github.com/iobridge/ThingSpeak-Arduino-Examples/blob/master/Ethernet/Arduino_to_ThingSpeak.ino

Original posting: http://www.instructables.com/id/Send-sensor-data-DHT11-BMP180-to-ThingSpeak-with-a/