Last night (PST time), the LatencyTOP project gate received the first changeset from Intel containing LatencyTOP for OpenSolaris. This tool leverages DTrace to analyze sources of latency in the system, and help developers gain a batter understanding of why their app's may be running slower than desired.
You can clone the repository with
hg clone ssh://anon@hg.opensolaris.org/hg/latencytop/latencytop-gate
then follow these steps to build and run:
latencytop-gate $ cp usr/src/tools/env/opensolaris.sh .
latencytop-gate $ gedit opensolaris.sh -> edit GATE and CODEMGR_WS with the path to your workspace
latencytop-gate $ bldenv ./opensolaris.sh
latencytop-gate $ cd usr/src/tools
latencytop-gate $ dmake
latencytop-gate $ cd ../cmd/latencytop
latencytop-gate $ dmake
latencytop-gate $ i386/latencytop -> or amd64/, sparc/ depending on your system
If you're interested in getting involved in this project, now would be a great time for that. The application itself is relatively new, and there's lots of possibilities for improving and extending its functionalities.
Here's a screenshot of LatencyTOP running on my laptop.

The tool lists system-wide and per process sources of latency. The horizontal list of process at the bottom scrolls to the left/right so you can observe a specific process.