writing to magazines (about your software)

i'd like to email a few PC magazines and tell em about my software. i went to the websites of several magazines, and many encourage you to email the editors about your software. in what form should i write my email? at least one website mentioned sending a press release. so i'm just wondering how you all think i should start off the email and generally how to do it. i've written before but never got anything out of it (i've been contacted BY a magazine before tho)

some of the websites simply tell you to email the editors, and then go on to list a half dozen editors' email addrersses. i don't plan on sending emails to all of them, but i guess it'd be ok to email a couple of them.
[731 byte] By [gnznroses] at [2007-11-20 1:55:07]