For you average user, is Linux worth while?
does it have any benefits over Windows?
It's free.
Upgrades / new versions are free.
No viruses, spyware, malware.
Greater stability.
Most software is free and located in repositories which makes locating and installing it easier.
Lower system requirements.
Just about everything can be customised.
Much better eye candy than Vista (if you are into that - will require some configuration though)
Very knowledgeable community support.
I would suggest you download the openSUSE 10.2 Live DVD. This allows you to run openSUSE 10.2 from the DVD without any installation so that you can try it out.
I am recommending openSUSE because of it's polished and professional look "out of the box".
openSUSE 10.2 Live DVD
Another one to look at is Ubuntu, whilst nowhere near as polished looking it's a good distro to start with.
Ubuntu provides a Desktop CD which is both a Live CD and Installer.
Ubuntu Desktop CD
Take a look at this, just came across it on Digg:
http://img182.imageshack.us/img182/2135/thetruthaboutswitchingpmp8.png