Anyone know a software that can tag/bookmark specific times in a audio file?

I have lecture recorded on my iPhone, I plan to copy them to my computer via iTunes.
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When I have them on my computer I would like to be able to tag specific times such as at 14:30 and add a note “The Marketing Mix”. I figure there is a program out there for this, but I end up primarily finding mp3 file tag programs.
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I’m running a windows XP and Vista machine.
I’m assuming iTunes/iPhone will have the file in m4a. (eww)
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Anyone know of something of the sort?