Here is a very handy list of promoted context properties and their name spaces that I found on Stephen Kaufman's WebLog.
Receive Side
1. ReceivedFileName (http://schemas.microsoft.com/BizTalk/2003/file-properties)
2. InboundTransportLocation (http://schemas.microsoft.com/BizTalk/2003/system-properties)
3. InterchangeID (http://schemas.microsoft.com/BizTalk/2003/system-properties)
4. ReceivePortID (http://schemas.microsoft.com/BizTalk/2003/system-properties)
5. ReceivePortName (http://schemas.microsoft.com/BizTalk/2003/system-properties)
6. WasSolicitResponse (http://schemas.microsoft.com/BizTalk/2003/system-properties)
7. AuthenticationRequiredOnReceivePort (http://schemas.microsoft.com/BizTalk/2003/system-properties)
8. InboundTransportType (http://schemas.microsoft.com/BizTalk/2003/system-properties)
9. LRPMsgBodyTracking (http://schemas.microsoft.com/BizTalk/2003/system-properties)
10. MessageExchangePattern (http://schemas.microsoft.com/BizTalk/2003/system-properties)
11. PortName (http://schemas.microsoft.com/BizTalk/2003/messagetracking-properties)
12. ReceivePipelineID (http://schemas.microsoft.com/BizTalk/2003/system-properties)
13. MessageType (http://schemas.microsoft.com/BizTalk/2003/system-properties)
14. SchemaStrongName (http://schemas.microsoft.com/BizTalk/2003/system-properties)
Send Side
1. CopyMode (http://schemas.microsoft.com/BizTalk/2003/file-properties)
2. LTPMsgBodyTracking (http://schemas.microsoft.com/BizTalk/2003/system-properties)
3. ReceivedFileName (http://schemas.microsoft.com/BizTalk/2003/file-properties)
4. SPID (http://schemas.microsoft.com/BizTalk/2003/system-properties)
5. ActualRetryCount (http://schemas.microsoft.com/BizTalk/2003/system-properties)
6. FileName (http://schemas.microsoft.com/BizTalk/2003/file-properties)
7. PartyName (http://schemas.microsoft.com/BizTalk/2003/messagetracking-properties)
8. ReceivePortName (http://schemas.microsoft.com/BizTalk/2003/system-properties)
9. WasSolicitResponse (http://schemas.microsoft.com/BizTalk/2003/system-properties)
10. AllowCacheOnWrite (http://schemas.microsoft.com/BizTalk/2003/file-properties)
11. RetryInterval (http://schemas.microsoft.com/BizTalk/2003/system-properties)
12. OutboundTransportCLSID (http://schemas.microsoft.com/BizTalk/2003/system-properties)
13. SPName (http://schemas.microsoft.com/BizTalk/2003/system-properties)
14. InboundTransportLocation (http://schemas.microsoft.com/BizTalk/2003/system-properties)
15. InterchangeID (http://schemas.microsoft.com/BizTalk/2003/system-properties)
16. ReceivePortID (http://schemas.microsoft.com/BizTalk/2003/system-properties)
17. SPTransportID (http://schemas.microsoft.com/BizTalk/2003/system-properties)
18. TransmitPipelineID (http://schemas.microsoft.com/BizTalk/2003/system-properties)
19. AuthenticationRequiredOnReceivePort (http://schemas.microsoft.com/BizTalk/2003/system-properties)
20. InboundTransportType (http://schemas.microsoft.com/BizTalk/2003/system-properties)
21. LRPMsgBodyTracking (http://schemas.microsoft.com/BizTalk/2003/system-properties)
22. MessageExchangePattern (http://schemas.microsoft.com/BizTalk/2003/system-properties)
23. OutboundTransportLocation (http://schemas.microsoft.com/BizTalk/2003/system-properties)
24. PortName (http://schemas.microsoft.com/BizTalk/2003/messagetracking-properties)
25. ReceivePipelineID (http://schemas.microsoft.com/BizTalk/2003/system-properties)
26. SourcePartyID ()