What kind of sensor can be used with Arduino

[Etam1]

What kind of sensors can be used with Arduino, like UNO, mega 2560. I am going to make a project and I want to use sensors like distance, temperature and so on but I don't have enough information about it. I am also wondering if there is requirements in choosing a sensor...
What should i pay attention to when using these two sensors?http://www.sainsmart.com/ultrasonic-...ce-sensor.html and this sensor http://letsmakerobots.com/node/30209

 

[ZomBiE80]

http://www.arduino.cc/ has lots of tutorials for arduino. Almost all kinds of sensors from light and ultrasonic to compasses and accelerometers.

 

[Falcon11]

ANY