Delphi is indeed a lovely day trip from Athens. The Temple of Apollo is quite impressive and I'm glad I had a panoramic camera to capture the structure. The theatre (or stadium) is also spectacular. It's worth your time to go through the Delphi Museum. I was naughty and took a flash photo of the Charioteer of Delphi. It came out blurry (serves me right) but the statue had quite an impact on me during my visit.