IBM launched RQM a couple of years ago.
The basic thought was to create a new test management tool that was based on the IEEE 829 testplan. And I think they succeeded.
Having worked with the previous version, 2.x I must admit it didn't always act as I hoped, but the newest GA version is really good.
Just the fact that here a testplan is in fact a fullblown testplan, and not just a collection of test cases, is eminent.
You don't need Word or another tool to add test plans and strategy into - you've got everything in one place!
I've helped implementing the tool at a couple of customers sites, and they really like it, find that the tool is easy to use, and gives you a good overview of what needs to done, and where you currently are in your test project.
I still need to test the integration with RFT, but that'll be the next step.