Virus Protection?

First, take a look at my Mac Malware Guide. That will give you more information about what threats are out there and how to protect yourself.

10.5.8 is a bit old, and is lacking most of the protections available on newer versions of Mac OS X. So the need for anti-virus software may be a little greater than on more recent systems. You should be able to use either Sophos or ClamXav on that system, both of which are quite good. Even better, they're free!

SAM2312 wrote:

I have Mac OS X 10.5.8, what virus protection is recommended for this system?

I would give first consideration to upgrading your OS as high as possible before spending a dime or much energy on additional malware protection. In addition to Thomas' great guide, you might find this new article of interest TidBITS: Do You Need Mac Antivirus Software in 2013?