Richard Tkachuk has set up a site www.sqlserveranalysisservices.com dedicated to Analysis Services 2005. The most interesting thing there so far is that he posted there the source code for his project - ASP.NET control which allows browsing Analysis Services cubes. The server side code uses ADOMD.NET, and the client side is just IE. The server is running demo of this control on top of the Beta version of Analysis Services 2005 (Yukon).
P.S. Richard is the guy who implemented ASP based thin browser which was included in the SQL Server 2000 Resource Kit