Are there any tools for optimizing placement of Airport Base Station

I have both a Airport Extreme B/G and a Airport Extreme N unit. I also have several Airport Express units on the network. Does any one know of any tools (Hardware or Software) that can be used to identify the best physical placement of Airport Units in a multi-story building. I need to find where the connections are breaking down and where the dead spots are located. My network works but has random problems and now that I have an Apple TV the problem is worse. If I cluster everything together in one room it works like it should. Once I place the units where I need them it breaks down.
There must be some tools that are available that can assist in the physical placement issue.

You can use something like AP Grapher to determine where wireless network coverage is working well.

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