If your company is of relatively limited size and it's practical to walk around every once in a while, you might want to use the RF scanning approach. There's a free product called NetStumbler available to assist you with this task.
There are also various products that claim to perform rouge access point detection from the wired network. I've never worked with any of these personally, but you might want to try looking at the WiSentry product. One of the biggest advantages of this approach is that you'll be able to detect activity from access points that don't broadcast their SSIDs. Tools like NetStumbler are unable to detect these sneaky APs.
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