I upgraded this morning!
Before you sync your iPhone/iPod, click on the word "applications" in the iTunes window (down the left side of the screen, near the top). Then it will show all your applications. There is a place to click to check for upgrades in the bottom right corner of the screen. Click on that, and it will display all apps that currently have available upgrades. iBird Pro should be displayed. Click on it where it indicates to download it to iTunes.
Then, sync your iPhone/iPod as normal and it should download and install the app.
It is a very large app, so it takes a while to load and process. At several points it looks like it is stalled, but be patient, that is what it is supposed to be doing.
My first impressions are -- GREAT!
Going to wait a few days to check out all the features then write another review, this time for the current version. Want to wait so I can be very specific as to the features I am referring to.
Doug