I love Super Trouper too. The video is superb, and I love Anifrid's jumper in that one, so blue and colourful. I also love the way Agnetha winks to camera and points at the spotlight (the Super Trouper of the title) and then holds up her finger to indicate she feels like a number one.
One of the great misheard lyrics of all time though surely with the lines "I was sick and tired of everything, when I called you last night from Tesco"
Seriously though, great song, and the album's not bad either with some exellent tracks that could have been released as singles, listen to "The Piper"
with its haunting lyrics, hinting at a darker side to ABBA. A favourite of Ed Stewart on Children's Choice as I recall.