It sounds to me like Laura Innes (formerly of ER). The actress who appears on camera doesn't seem to match the voice speaking. Of course I have no idea if it's actually Ms Innes but it sounds like her.
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Totally sounds like her. Even the Rav4 ad where this family of 4 is dancing at a camp site has a voice over that sounds exactly like her. :)
Lisa Horner is the voice of the "start the car" IKEA commercial.
Sue Ellen had 2 voice actresses in Arthur. Patricia Rodriguez (also known as Patricia Rodrigues) was the original voice actress for Sue Ellen from season 1 to season 8. In season 9, Jessica Kardos replaced Rodrigues as the voice actress for Sue Ellen. Although in season 9, she was considered a cameo character and barely spoke but spoke more often in season 10. Kardos also play Sue Ellen in Postcards from Buster and is her most popular voice actress.
Henry Dardenne
It is Floyd VanBuskirk. He also is the voice of Blizten in the hilarious Verizon Christmas commercial last year.