If you have installed VS2008 and/or VS2010 (full), you will notice that OleView is not installed!
The product team decided to remove this utility from the tools-folder.
But you the source-code is still available! You can find it under
C:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\Samples\\1033\\VC2010Samples.zip
Extract the files and build (the release version of)
Then you have the two files: oleview.exe and iviewers.dll
Also, the same problem is with the OLE-Test Container (tstcon). This application can also be found in the samples.
See also: ActiveX Test Container Application is Still Available