This is one of my favourite short stories of all time, and every single time I read it it brings tears to my eyes. Unfortunately that means that it's difficult for me to read it aloud without blubbing! However I spent an enjoyable part of yesterday giving it my best shot. I hope you like it. It's a wonderful story and I've tried to do it justice.
More information about the author can be found in the O Henry Wikipedia entry, and the story itself has its own entry - see The Gift of the Magi (spoiler warning: don't visit the page until you've listened to the story first).