The character you play in Portal is never named throughout the game. I can see that it's a female by looking through a portal, but the game always skirts any information about the character (e.g. GlaDOS speaks to you, but cuts out the name by saying "Subject name here.") I understand that Valve did this because they want you, personally to become more immersed in the game, but I think having a compelling character with a great story makes a good game even better.
Who is she? What is her story?