Eh, I learned from the experience of others over the 3 years that I posted/ hosted on a labor board that there are no good, reliable signs of impending labor. Always good to be prepared physically (packed...) but be emotionally prepared to wait. :)
Of course, when (if) the time comes when I am facing labor day with #2 I am sure that all my "book smarts" and past experiences (common sense) will fall out of my brain as I just want to know when! I already found myself overanalyzing possible pregnancy symptoms. :)
Good luck and I hope that your time is near. Now, go pack! It could be hours or weeks.