IBIS (Input/Output Buffer Information Specification) is a behavioral modeling specification for characterizing the inputs and outputs of integrated circuits. This 7 minute video shows how to use them in a signal integrity workflow. The ADS Transient-Convolution Simulator is used to determine the eye diagram and jitter decomposition from a schematic that includes IBIS models from two semiconductor companies (Xilinx and Micron in this example) joined with a channel model consisting of traces and vias.
Teraspeed Consulting IBIS Resource page has a comprehensive list of all things IBIS.

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Happy Thirteenth Birthday IBIS | Signal Integrity Tips // Dec 12, 2008 at 2:36 pm
[...] For a look at how our tool, Agilent ADS, uses the IBIS templates, check out this post entitled Workflow with IBIS Models. [...]
Signal Integrity - Happy Thirteenth Birthday IBIS // Sep 9, 2009 at 3:48 pm
[...] For a look at how our tool, Agilent ADS, uses the IBIS templates, check out this post entitled Workflow with IBIS Models. [...]