Can I tether my Droid X using the USB cable and then text from my PC through my DroidX?
I'd say no, but then I haven't even heard of someone trying this.
You can use this VZW page to send txt messages from your computer though: https://text.vzw.com/customer_site/jsp/messaging_lo.jsp
Just text from the Verizon site, people will still see it as if you did it from your phone.
That is a viable option, but it only works if I am texting to a verizon phone it seems.
Artsdroid wrote: That is a viable option, but it only works if I am texting to a verizon phone it seems.
That is correct, other carriers have similar sites for web texting. I even used a universal text about a year ago but I don't remember the name of the site.