The key Business Intelligence features that are now unique to Sharepoint, which even SQL Server needs to complete the eco-system of any Business Intelligence project are Performancepoint Services, Excel Services, Visio Services which facilitate Strategy Maps, web parts that hosts SSRS and Excel Analytical Reports, and Powerpivot. There is a lot to know and learn in Sharepoint 2010 Business Intelligence Features.
How about a book that gives a higher level overview with a demo ? It might seem boring to SQL Server folks. But how about a video tutorial or webcast that takes you on a guided tour of all of these along with a demo, which is also available free of download !!! Yes, I am not kidding. This is a session presented by Mike Fitzmaurice, and this video is available for download from Channel9.
So download this video tutorial / webcast (whatever you call it) and get going on a Sharepoint Server 2010 Business Intelligence Overview. Be advised that this download is over 1 GB and contains over 1 Hr of video training. I recommend it as a must-watch video for MS BI folks.