I've gone through this phone so many times and i cant figure out why my phone will not vibrate for notifications. I've gone into messaging and checked the "vibrate" selection, im pretty sure everything is set correctly but still nothing. It will vibrate when i have an incoming call. But that's it. I have no idea what to do now. Please help!

are you using Handcent or the stock messaging? ( I use Handcent)
I had a similar problem... my texts wouldn't vibrate. I had the setting for vibrate as "only when volume set to vibrate" and it never vibrated with an incoming text. I switched the setting to "always" and I haven't had the issue since. And when on silent the incoming texts don't vibrate! Win Win!

im using the stock messaging thing.

default messaging app:

messaging (main page)
menu - settings
notifications - CHECKED
ringtone - (anything)
vibrate - CHECKED

Yeah thats how mine is set up.

are you sure your phone is not set to silent? vibrate is turned off when the phone is on silent.

positive its not.

so i installed the handcent sms and it still will not vibrate with that. what gives?

I'd try a battery pull first. If it still doesn't work after that, I would try a hard reset.

i did a battery pull and nothing different..what is a hard reset?

Sorry, I meant to say a "factory data reset". It wipes your phone clean. If that doesn't do it, it's time for an exchange.

The same EXACT thing happened to me, and I took it in to the verizon store. They replaced the phone, and it still didn't vibrate. An hour or so later, the new droid started vibrating. The tech there didn't know what is going on, and I sure as heck don't know what is going on. But if I were you, i'd try to start safe mode, if it doesn't vibrate in safe mode, take it in. If they can't fix it at the verizon store, they will replace it and hopefully after a little bit your new droid will work fine like mine.

wouldnt that just erase all my data?

If it works in safe mode, it is most likely related to a third party app that you have downloaded. Safe mode only opens the stock apps on the Droid, so that is a good place to start before wiping it clean.

safe mode?

http://www.droidforums.net/forum/droid-hacks/4420-safe-mode-booting.html

so i was starting it in the "safe mode" and it would do the droid animation and then show the eye..then go black for a few seconds and then restart the droid animation and so on.. is that normal?

Is there anything I should save to my SD card before I reset it?

I have this same issue. I figured it was a bug with Android and didn't think much of it since I rarely use the vibrate function. I haven't tested it since the 2.0.1 update, but if most people are saying it's fine for them, it makes me worry a bit. If you end up doing a hard reset, please post results.

Ok, so doing a quick google search, it seems that there are lots of people with this issue. Before you go and wipe, it may be worth calling VZW or stopping by a store.