I designed it this way because none of the time zone tools out there reflect the actual nature of time (zones): simultaneous, overlapping lines thru time. ETZ doesn't just give you the answer, it helps you create a useful model of understanding to take with you & use even when you're not looking at ETZ.
We've been slowly improving it, so expect more options for customizing the tz's you see & static links to times in the future, etc.
EDIT: if you like the design of ETZ, you will probably love Freckle, which is our time tracking / productivity tool -- all about making your data painless to get, then super useful & actionable: http://letsfreckle.com/startups/