It is just a personal opinion. Here are some of the best GigaPan panoramas added to gigapan.org on May: (Some of them are huge, some are beautiful, etc.)
Here you can see all of them together.
02. Nano-GigaPan of and head
03. Tiger 17 TPC
04. Carnegie Mellon Universicy 2009 Commencement
05. Final del Open Madrid entre Rafa Nadal y Roger Federer
06. STS-125 Shuttle Atlantis on Pad 39-A the evening before launch
07. Rice University : My First 360 - Academic Quad, the Day Before ...
10. Eola Lake Orlando
11. Star birth in the extreme
Please feel free to comment and add your suggestions.