A nice article providing step-by-step instructions (although I haven't quite figured out what the light bulbs are for??)
But I agree with Koen, perhaps something that highlighted potential gotchas when installing SSRS 2008. For instance, when installing on W2K8 server (which for some reason isn't included in the list of supported Server OS's) and running Report Manager for the first time, you can get some permission denied errors. This can be overcome by running IE as administrator and then navigating to the Report Manager URL and then configuring permissions.
Other suggestions might be installing and configuring a scale-out deployment.
Oh, and IIS is not required for SSRS 2008.