Enabling the following features at a team site collection will allow you to create a BI Centre as a sub-site to it.
Site -> Site Actions -> Site Collections Administration -> Site Collection Features -> SharePoint Server Publishing Infrastructure
Site -> Site Settings -> Site collection administration -> Site Collection Features -> PerformancePoint Services Site collection features
Site -> Site Settings -> Site Features -> PerformancePoint Services Site Features
My Weblog registry is a directory which stores settings and options for my Professional Life (mostly SharePoint)