Ch 18 states a problem with using "Jump to Url" to link to other reports with the generated parameter value as the UniqueKey in OLAP datasets.
UniqueKey uses an "&" to denote the member Key and this gets interpreted on the parameter string of the URL as the end of one parameter and the beginning of another.
The solution I'm suggesting is to escape the "&" as %26 for direct addresses and double escape the "&" as %2526 for javascript addresses.
By the way Reporting Services seems very useful for Analysis Services.
Geoff