Linux (and other unix-like systems) were designed from the group up to be secure and allow secure multi-user access and networking. The reason why the Microsoft Windows family of operating systems have so many viruses is that it was originally designed as a single-user system and much of the security has been bolted on as an afterthought. This means that many more (and more severe) holes will exist.
There are actually viruses for linux, but they are generally far less effective.
virus is a program, it must have previledge to do nasty stuffs.
It is no doubt linux has virus, but when you running your linux as a normal user the virus cannot do anything bad.
If you run Linux as root (the equivaleng to Windows administrator), linux will be vulnerable to virus too.
By default installation, Windows XP creates a user which has administrator previledge, while Linux creates a user which has a normal (restricted) user previledge. This is the fundamental differences, since many Windows applications expect administrator previledge it is very hard to use Windows as a normal user. While most Linux applications are designed to run under normal user.
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