Here is the vcast.apk that was leaked in the DI update. It installed fine on my Droid 1 and read somewhere where it installed fine on the Droid 2 so I am thinking it will work on most verizon androids. However the store doesn't appear to be live just yet you will get an error message until the market is live.
Also the .apk is in the zip file so just extract it on your pc/mac and you should be all set.
*Do note this is for the new Vcast app store*