Many a times I have wondered how some of the sites have an icon appearing before their URL in the address bar. But for some reason there is no icon appearing if I visit my personal page. I recently figured the answer for this while visiting this site. There was a side note appearing in that site, taking me to the Microsoft's article on how to make this icon appear. Hope you would find this useful and interesting.
Apart from that, I find ZYTRAX site extremely useful in many ways. They have excellent tutorials on LDAP and DNS. There is a lot more to read about from that site.