And its all about bug trackers. Gosh this is a boring business fight to watch - well I guess its slightly less trivial then facebook apps ;)
A bug tracker can be like email, on the screen all the time, with a lot of our communication with co-workers going thru it ( and in fact the good ones incorporate email into them very well. )
So, it's the software we are living in. Next to our text editor, it's maybe the MOST important software.
Not counting Pandora, of course.