On an environment I have just installed I ran into an issue when I tried to start the Central Admin component on a second server. The environment consisted of two load balanced web servers and an application server. The application server had been installed first, so was running the Central Admin component. IIS had been installed on the D drive on this server.
When I tried to start the Central Admin component on one of the web servers (which only had a C partition), the component refused to start. After looking through the logs the cause turned out to be that SharePoint tried to configure the Central Admin on the D partition, because the application server also had been installed on the D partition. The only way to get around this was to create a D-partition on the web servers.
So when you are installing a SharePoint 2007 environment, make sure all partitions on all servers are the same. Or at least the drive letters.