http://www.satflare.com/track.asp?q=Iridium#MAP\
This is a website I found where you can track basically all visible satellites. It has a few key features other satellite trackers I've found don't:
It shows a map of satellite paths through your sky, which can be set to any time
You can use it to predict Iridium flares, when and where to look and how bright
I really suggest checking it out and seeing when an especially bright Iridium flare will appear in your sky! It's great for all kinds of tracking and predictions.