Happy 58th Dan!!!
The Blues Brothers (1980)
In this classic, Dan plays the lead character, Elwood Blues, opposite John Belushi's Elwood Blues.
This movie had an amazing cast which included the likes of James Brown, Aretha Franklin, Ray Charles, John Candy, Carrie Fisher, Twiggy, Frank Oz, Joe Walsh, and Paul Reubens, among many others.
The music in it is pretty awesome too.
In this Ivan Reitman film, Akroyd plays Ray as one of the Ghostbusters alongside Bill Murray's Peter Venkman and Harold Ramis' Egon Spengler.
Other members of the cast include Sigourney Weaver, Rick Moranis and Annie Potts.
I always thought that those 3 together (Akroyd, Murray, Ramis) made a really great trio acting together and would have liked to see them in other films together.
This film of course spawned a sequel in 1989 and there are plans to do another sequel, scheduled for released in late 2012.
Grosse Pointe Blank (1997)
In this film, Akroyd plays Grocer who is the lead character's (John Cusack's Martin Blank) arch-nemesis (for lack of a better term).
The soundtrack to this film is pretty amazing and it also has a really good cast to it including Minnie Driver, Jeremy Piven, Joan Cusack, Hank Azaria, and Alan Arkin.