We've been working on this for a while, so while we weren't expecting to have this ready for today, we figured that we might as well try. In particular, it hasn't been stressed under load -- there may be some bumps along the way. So with that in mind, please feel free to set up voice posting if you haven't done so already, and then call 1-888-840-6189 to make a voice post from anywhere in the continental United States. :)
(Unfortunately, if you aren't in the US, you won't be able to use this number. We're still looking for a good international provider -- if you have one you'd like to suggest, please let us know!)
EDIT: This is now our primary voiceposting number -- the existing numbers have proven to be incredibly unreliable, so we're migrating to just this number. Update your contacts lists!
EDIT EDIT: We'll be working on getting alternate numbers, for all of you who've commented saying that this one doesn't work for you (for whatever reason). Keep an eye on news :)