On 4th July 2008, for the first time in over 20 years, all four members of ABBA were together at the same venue. As a result, YouTube has been bombarded(!) with many videos containing interviews with the ABBA members (in English and Swedish), footage and photographs of them along with the cast of the movie...and Angetha and Frida doing some strange folk dance with Meryl Streep! ;)
As a slight bonus, here's a Dutch radio interview with Björn and Benny, about the movie, that took place on the 2nd July.