Forgot to mention two new features, both accessible from the main inventory page:
1. Google Earth .kml Placemarks file
Explore all of the suspension bridges with lat/long coordinates using Google Earth. Currently 551 of the 1,939 bridges in the inventory have coordinates.
2. "Inventory Excluded" snapshots/contributions
Browse all of the suspension bridges pictured on my site that do not appear in the Inventory.
-david