I like using a hypercardiod pattern microphone for a lectern - you get a really solid null on the sides, where the speakers are, and get really good gain before feedback. As a plus, you get a little audience in the microphone, which, if you're recording a show, adds some color to the recording.
For events with mixed talking head and other program (such as music for masquerade entries) I like to run the other program through a compressor with sidechain input, and feed a vocal submix into that sidechain input. With a mild setting on the compressor, this makes the MC's microphone cause the music to lower in volume slightly as he speaks, making the MC more intelligible, and letting the music still be loud enough to have effect when the MC isn't speaking.
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