One easy way, is just to understand the breadth of services out there and how they fit together. Here is a fantastic, and fun, starting point by way of AI’s 2008 Web Trend Map laid out like the Tokyo metro. There is an interactive version here.
Why not print one out and stick it on the office wall – you might find your staff take some interest!
I think I preferred the layout of their 2007 map, but who cares what I think… 😉