Ed,
POS 2009 will be released in th next few days. This is the lastest point-of-sale operating system from Microsoft, and while it is not exactly a plug-and-play replacement for RMS, it does have tools to upgrade your exisitng RMS Store Operations data into the POS 2009 database. With the new taskpad interface, it can handle drilling down from the department level to the category level to the item level, and it does this right out of the box. The taskpad can also be customized with additional functionality, and you can create role-specific taskpads based on your user rights.
The one caveat is that this system is not compatible with RMS Headquarters. If you are using HQ to manage your multi-store enterprise, there may not be much to offer this year. However, if you are a single store, or if your stores are not using HQ to synchronize with the corporate office or do store-to-store inventory, then you should be able to use POS 2009.
Talk with your Microsoft partner about this, or if you do not currently have a partner, please feel free to contact me