One of the features of NetLog is near instantaneous translation into each language it serves. This means that with access NetLog grants, an application developer has the ability to reach a localized audience in their native language. This makes it easier for developers to create globally accessible applications and helps ensure success.
NetLog also has what they call a "credits economy." The developers are being granted access to this as well. This seems to work as a way to make money in a way other than through advertising revenues on the NetLog network. I was unable to find any hard data stating what kind of revenue could be expected, but it seems to operate in a way similar to the iPhone App Store, allowing developers to charge credits for their applications or offer them for free.
If you are a developer wanting to work with NetLog, the network is accepting applications that it determines add value for their members. Learning a bit from Facebook's mistakes, they are denying applications access that require the user to leave the site, install the application or invite friends. That's a refreshing change from applications requiring users to spam their network on Facebook and MySpace.