I just read this guest post on Brent Simmons' blog written by Nick Bradbury, author of FeedDemon (and the corresponding post from Nick here). Now that NetNewsWire and FeedDemon are owned by newsgator, it's obvious that the two applications can align more closely.

From Nick:

Following my brief experience with OS X, I decided I could learn a lot from Mac applications, many of which are more elegant and simpler to use than their Windows counterparts. And NetNewsWire is the one I've learned from the most - it packs an awful lot of power into a deceptively simple UI.

The reason I mention this is that both authors are asking questions about how to make their applications better. I want to learn why people like the Mac so much and see if that essence is particular to the Mac and OS X, or something else that we can all benefit from on all operating systems. Ignore stability claims/viruses, etc. as I don't want to talk about drivers or anything of the such. What is your favorite Mac application? What is your favorite Windows application? Why?