Wikipedia describes Linux as
Linux is a Unix-like computer operating system. Linux is one of the most prominent examples of free software and open source development; its underlying source code can be freely modified, used, and redistributed by anyone.
Because of its free nature many have turned to Linux to provide them with operating software for them to use on their PS3 and yes it is possible to surf the internet on your Playstation. After you have downloaded it onto your PS3 you will still be able to do all the other stuff common to the console - listen to music, play games, watch videos etc etc etc.
Here's how to do it
http://microblog.routed.net/wp-content/uploads/2007/01/ydl50_ps3_guide.pdf
All in all it actually quite simple even though it may look more demanding.
Also when you got that completed (if you have the 60GB version) you may be wondering what to do with the spare 40 GB you have left (that is saying you manage to use 10Gb of gaming memory) why not download movies or songs onto your PS£ and take the most advantage of your new found computer system!!
Full Range of Movies and Music Videos
Or
If you have a PSP (which all playstaion fan should) why not try out this site. It had all you could ever want with your PSP downloadable under one domain. Not to be missed
For all your PSP needs Click Here!
Remember this could probably work on your PS3 to as the interface and make up of the consoles are exactly the same!