Yes there is a wonderful site called the
Virtual Tourist that is very similar to MM, but it encompasses all the world. when you join, you choose the forum you wish to participate. They have a wonderful Italy furum, whith specific forums on your favorite city, i.e., Rome, Pisa, Florence, etc.
It is extremely easy to use and very friendly as well. Lots of good information too, like MM. They are easily searched by location and they allow you to make your own personalized guidebook!
Also, they give you space for a small webpage of your travels!
It is recommended by National Geographic Traveler!