Just a few pointers for myself on Theme generator, Templates (40 and 33), Social Networking and Inbound Mail.
Sharepoint Skinner – Theme Generator (reference Mark Harrison)
Application Templates WSS 3.0 – Fantastic 40 (English) and 33 (Multiple Languages, also in Portuguese – Portugal) (Reference Technet.Microsoft.Com)
Enabling and Manging Social Networks (reference Microsoft SharePoint Products and Technologies Team Blog)
Email enable lists and inbound mail (reference Joel Olleson)