So SSRS in the cloud has just been announced! See this post on the SQL Azure team blog:
…and also this 20 minute video from PDC giving a lot more detail:
Basically it’s the SSRS you know and love with only a few limitations: for example it only supports SQL Azure as a data source and there’s none of the developer extensibility options (like custom data extensions) available yet.
I can’t wait for SSAS in the cloud…