Here's a small command line utility I put together which allows you to display licensing, and some summary information about your management group.
What may be useful is the display of the evaluation license expiry date and the number of days remaining for those running the eval version (you don't want it expiring at the critical time you're putting it through its paces).
MGInfo can either be run on the RMS itself or remotely. Running remotely will require you to copy the SDK DLL's Microsoft.EnterpriseManagement.OperationsManager.Common.dll and Microsoft.EnterpriseManagement.OperationsManager.dll to the same folder as MGInfo).
http://home.comcast.net/~the_eastwoods/MOMDownloads/MGInfo.zip
Here's the information that will be displayed.
For the Essentials 2007 Eval version for example which has a 90-day expiry:
********** Product Licensing and Summary Information **********
Management Group : CHIPARUSSystem Center SKU : EvalSystem Center Product : SCEVersion : 6.0.5000.0Product ID : nnnnn-nnn-nnnnnnn-nnnnnExpiration date (Local time) : 9/2/2007 8:43:41 AM , 89 days to goLicensed for : 11 servers, 50 clients
********** Summary Information **********
Installed Management Servers (Includes RMS, Management Servers and Gateways Servers) : 1Managed Computers pending installation : 0Agent Managed Computers : 6Agentless Managed Computers : 0Managed Devices : 0Management packs installed : 78
********** RMS SDK Service Information **********
RMS Server : chiparus.contoso.comRMS Server Action Account : omactionSDK Service Account : contoso\CHIPARUS$There are 3 users connected to the SDK Service :User - NT AUTHORITY\SYSTEMUser - contoso\omactionUser - contoso\cliveeastwood