Update: MKStoreKit 4.0, an updated version of the one presented here is available. Please check it out and use 4.0 instead of this. Last week, Apple announced that in-app purchases will be available for free apps as well. This could probably free developers from creating “lite” and “pro” versions of the app and allow developers to “unlock” features inside the app and create business models that the...

With the outburst of Twitter and microblogging services, many companies who want to make some quick money started services that include, URL shortening like tinyurl, bit.ly, tr.im and others or image sharing services like TwitPic, yFrog and so on. However, due to lack of a proper business model, some of these sites are struggling to meet their bandwidth costs. Because most of these services are just a week long PHP programming work,...