From All Facebook:

Two weeks ago I wrote about Zynga surpassing 60 million monthly active users on Facebook. As of today the company now has over 72 million monthly active users and has the top application on the platform based on daily active users. FarmVille, an application which duplicates many of the features of the second most popular application, Farm Town, has now surpassed 5.3 million daily active users. Growth doesn’t appear to be slowing which isn t surprising since the company has invested over $1 million in promotion alone.

The company is poised to make $100 million a year, and if this growth continues those estimates will look very lowball.  A quick look at Zynga s IP shows they tend to take a few game ideas (Mafia Wars, for example) and replicate the experience except for the location and characters (Mafia Wars in space, Mafia Wars in the military, etc.).

So far they’re riding high, and hopefully they’re banking some of that money to get creative with new IP before the cash cow runs dry.