Google Earth has a file you can download to see Airspace in 3D. (new to me, I had no idea)
This in conjunction with Skyvector is a great airspace learning tool.
Absolutely Fantastic!!
http://www.lloydbailey.net/airspace.html
Took off from Yarrawonga , Victoria, Australia and flew across to Albury airport. This is normally a Class C airspace, however on very rare occasions it reverts to Class G.  ...
...morning, both YFT students flew across the lake and saw the devastation for themselves, before the ubiquitous media helicopters entered the local airspace, taking over the CTAF radio f...