What version of the iPhone software are you running? You can find it by going to settings, tap "General", then tap "About" and look for the Version entry. It should look something like "2.2 (5G77)" or some such.
Also, make sure you've dragged the Indigo_Touch_Public_Beta.mobileprovision file over to iTunes (you can do it again - if it took the first time it'll just ask you if you want to reimport it, just click yes).
Lastly, you did send us an email with your UDID before the beta closed, right? Anyone who submitted their UDID after the beta cutoff should have gotten an email saying they missed the cutoff.