I thought I'd let folks know that I do have a working version of BirdTrax type functionality on my site that people are welcome to reference if it helps them. Ebird deprecated the old technology last week, so it required some new coding. I have a "notable" birds tracker that shows anything within 175 miles. I also have a tracker that shows all sightings within 50 miles of Littleton just like BirdTrax used to.
Hopefully it helps, but no promises it will always work if ebird changes things up again!
Thanks.
Matt