The public focus on many RFID systems to date has been around large supply chain systems and compliance mandates for suppliers. But current thinking on RFID is now more towards the benefits of smaller 'closed-loop' systems that can serve as a basis for future, 'open' systems.
The options are well covered in this article by Bert Moore of AIM Global, which sums up the current state of play in the development of RFID applications, as discussed at AIM's recent 'Summit' event.
Incidentally, a recent AIM release also discussed the use of RFID in 'green' applications. You can read the release here.