I always need to get rid of the audio for most of the clips I use in Premiere 6, the most efficient way I've found is:
import it into your bin, then double click on it to make it appear in the window for marking in/out points, mark your in and out points as usual then click the little icon of the sound wave underneath where the clip's displayed, then click on the clip and drag it onto your timeline where you want it. This will do the same as right clicking, then unlinking, then deleting, but with a lot less steps.

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P4 1GB Ram 50+160GB, Win XP, Premiere 6, Encore+Photoshop, Lite-on 4x dvd rw.
Sony TRV-250, Panasonic NVGS-75, Canon MV600i