Google Product Forums
Just Lookin Around
Imagery / Data / Layers
There are a number of features that would make GE (Google Earth) over the top.
Advanced Search Options
elevation search (narrow entire world to specific locations that meet your search needs - I was informed by a doctor that my heart condition required me to be above 4k')
angle of slope (helpful to adventurers and climbers)
geo type (coal, granite, ironite, etc)
helpful info (areas that effect magnetic complasses, gps, or even medical equipment)
Special Handicap Activities (specific for disabled activities - horses, rafting, etc)
Caves and Caverns
Trip Planning (like google maps - links to airport/travel agents)
GPS Link Portability (import / expor)
For me topo, trip planning and evevation would be awesome"r".