TPC-E is a database performance benchmark that was ratified about two years ago and first had results posted against it about 18 months ago.  Sure, its the new kid on the block in terms of performance benchmarking, TPC-C has been around for years and it's tried and true.

But TPC-E represents a more realistic benchmark for the average company to implement.  Even IBM agrees that it is a more realistic benchmark than SQL Server.

Charles Levine has recently asked the question (along with Brian Moran from SQL Server Magazine) have asked "Where are IBM, Oracle and Sybase?

I'm not going to comment further save to say that TPC-E seems to be the benchmark to use - so what is holding back the other RDBMS vendors from posting results?

I encourage you to read Brians speculation here, along with Charles's here.  The mystery is intriguing...