Apple just introduced iPhone OS 3.0 (beta) and 3.0 SDK. There are lots of improvements and new features. iPhone is a great platform for developing mobile applications. OS 3.0 makes it even more compelling for building Subject-centric solutions. One of my favorite features is Push Notification Service.
We introduced Subject-centric RSS feeds some time ago on Ontopedia PSI server . With RSS feeds in place, we can subscribe and monitor information about subjects that we are interested in using RSS (including mobile) aggregators. As Ontopedia user, I can submit an assertion, for example, that I am thinking about Blogging Vocabulary . Everyone with RSS subscription to Blogging Vocabulary or to my PSI will be notified about this new assertion.
But, of course, existing RSS aggregators and pull model do not allow to realize full potential of Subject-centric micro-blogging. Services like iPhone Push Notification Service are game changers. I wrote this blog post many years ago about Subject-centric real-time messaging. Now is the right time to implement it. And with new Apple iPhone SDK it should be fun.