"Yes" is the answer to almost all forms of your question (I'll anticipate some forms of it):
Can I tether with the Droid X? Yes. There is a $20/mo addon option from Verizon that turns yoru phone into a wireless hotspot for a handful of devices. Note that this will have a 2GB limit and you will be charged something like $50 per additional GB!
Can I tether with the Droid X without paying this additional fee? Yes. If you root your Droid X (if/when it becomes possible), then you can download
Android Wifi Tether for Root. This turns your phone into a wireless hotspot. If you do this, you will not have a 2GB limit and it will be free, but you will also void your phone's warranty and you may permanently break it as well. This is NOT the "obvious" thing you should do unless you are willing to break your $600? phone and go out and buy a new one. (NOTE: As of now, there is not yet a Droid X version of this application. However, once the Droid X is rooted and this method is possible, it won't be long until this will be available.)
Can I tether with the Droid X without paying this additional fee and without rooting my phone? Yes. However, this method requires you tether via USB or Bluetooth and NOT via wireless. There is an application on the Android Market called "
PdaNet free edition" that allows you to do this. Doing it this way, you do not void your warranty and you do not have a 2GB limit. However, this will not work for all situations. For example, you cannot use this method to provide internet access to your iPad.
These are your options. None are ideal. The first option costs money and is restrictive, but is the easiest and safest. The second option is the riskiest (and therefore potentially the most expensive) but had the best end-result. The third option works well if you only want to tether to your laptop and you're computer-literate enough to operate the processes required to connect in that way - i.e. it's a good middle-of-the-road solution that contains no risk and no cost.