Seven's Sunrise site offers a list of hints on how to cut down on physical junk mail. The suggestions tend to the obvious, but there's contact numbers for getting off at least some mailing lists. Another useful option a relative of mine used was to return any unsolicited offers for credit cards and the like in the enclosed reply-paid envelope, pushing up the costs for the junk mail sender. If you've got extra hints for cutting down junk mail, let's hear them in the comments.
Cut Down On Junk Mail
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Speculative fiction is the literature of change and discovery. But every now and then, a book comes along that changes the rules of science fiction for everybody.
I drive a lot of different vehicles when I need to get around, but I'm always a little worried when it's time to fill them up. Will something happen if I use 91 instead of 95, or vice versa? This thread at StackExchange answers the question.