I did a presentation last week for the Denver SQL Server User Group (www.DenverSQL.org) and the Colorado Springs SQL Server User Group (www.SpringsSQL.org) on Intro to Analysis Services. The slide deck can be found here: http://www.marcbeacom.com/downloads/IntrotoAnalysisServices.pptx. Both were short presentations (30 minutes) aimed at getting folks started with Analysis Services.
Both user groups have gone to two presentations a night. The first topic is aimed at entry level folks and is 30 minutes long. The second topic is more advanced for 60 minutes. If you are interested in speaking, let me know. We are always looking for good speakers to present.