You can finds lots of information by searching the web for Ipe wood. Below are some interesting links for you to start.

Here is the official US Forest Service Ipe page, along with links for the parent organizations and pages:

USDA Forest Service: Forest Products Laboratory: Center For Wood Anatomy Research: Wood Properties: Tropical Hardwoods: Ipe

Here are some other links with various Ipe information:

Educational Article about "Ironwoods"

Woodworking Information about Ipe

TV Show "This Old House" praises Ipe