One good source of IBI presentations is the archive of vendor and customer presentations from past Summit events (the annual users group meeting). See my blog postings for more information.
IBI provides good information on their product webpage. You can also check out their YouTube channel!
I also found about a hundred IBI presentations being shared on a site called SlideShare. These included documents from a variety of sources including IBI Executive Briefings, User Group presentations, Lunch and Learns, RFPs, industry analysts, and others.
Of course, you might consider contacting your local IBI sales office as a good source of information. Look up one of Information Builders' worldwide offices on their contact page.
If you would rather talk to an objective third-party, feel free to contact me with your questions about Information Builders' enterprise BI product offerings.