Simple examples...

The Service Management Facility (SMF) and DTrace are some of the powerful features of Solaris.

I have found these two links with some examples.

Using Service Management Facility (SMF) in the Solaris 10 OS: A Quick Example

End-to-End Tracing of Ajax/Java Applications Using DTrace

I never knew DTrace can be extended to even Ajax applications. Since I have been using Ajax for quite some time now, I think it could be of great help to developers.