Here is a short list of migration studies (not just birds) using sat-tags and geo-locators. These studies really valuable for migration studies and education - they can be a great tool for inspiring people to think about wildlife (which can only be a good thing!).
Great White Shark
Osprey (Loch Garten RSPB)
Raptor Research (list of papers)
Wildlife Tracking is really good website with lots more...