As a newbie I wanted to see some transactions in my wallet without spending money on an exchange. Just to get a feeling how this bitcoin thing is working.
Afer playing around with various sites I would say bitvisitor is the only one that is working reliable and is easy to understand (e.g. not overloaded with ads etc.):
http://www.bitvisitor.com/?ref=1A8KMTZ43Pcvoxn6gwzhUNxi2mdgXe3ATJ
Disclaimer: If you klick on the link I'll benefit from their affiliate program.