I found this links this morning and found some of the issues raised rather though provoking. Some of the linked articles/blogs argued that Apple should open source more of their applications, Safari and iCal seemed to be the popular ones mentioned, the idea was for the more advanced users to be able to fix and tweak the applications to their own desire, the counter argument was that Apple is a company that uses the integrated apps such as iCal and Safari to sell the Mac OS and help create a healthy eco systems for the entire mac platform. I agree with both sides, yes apple is a profit company, but open source can help some of the "lesser" apps to achieve their true potential. One of the articles mentioned certain open components such as the webkit, that lead me to the idea that apple might want to open up more of their kits, or create more open kits, iChat was discuss in the articles, why not create a chatkit (bad name i know) that can allow the OSS community to make the foundation of iChat what they want it to be, Apple will just give it the front-end and integration we have come to expect. So here is the actual question, do you think open source has contributed to the Mac OS, should apple continue using open source, would you decrease or increase the level of open source, and what would you like to see open sourced?