Vitamin had a good article on social web apps (like del.icio.us, flickr, myspace, etc.) by Ryan Carson. I totally agree with his observation that while social apps are the wave of the future, many folks like him (and I) just don’t have the time to invest in using the tools to get their maximum benefit; in either personal or community sense.
While I am taking baby steps by using del.icio.us and flickr myself, but I admit that I using both more for the convenience of me being able to get to my stuff from anywhere, rather than sharing with the world. Maybe that will change as I use the tools more?