webdudek - 7:31 am on May 10, 2008 (gmt 0)
One of the better ways to keep your system safe is to have it scanned on a regular basis.
Every now and then there is a new vulnerability discovered and there is no way for normal people to catch up on this.
Google up "vulnerability scanning system" and see the solutions available.
If your site is commercial and your are actually making money from your blog, I think it is important to keep it safe and be alerted when the industry knows about a new exploit.