I Like EDI's voice when probing Uranus!
My friend how are you doing? I hope you are doing fine. I’m the one you help with the TWEditor, i tried to contact you with a privet Message but it says that you Message box is full, so that why I’m sending you this Message because your privet box Message is full. I really need your help again my friend, I hope that you will receive this message.
If you spared the owner of Chara's strip club in the first game, Fist will make an appearance in Omega's Afterlife as will Helena Blake
Yeah these arn't really easter eggs, these and many other cameos are based on decisons you made in the first game and if you decided to import your end of the game save file into ME2.
One that some people miss is when you take control of Joker in the Normandy, he says to EDI "Ok I will trust you but if you start singing Daisy Bell..."
Which is a reference to the deactivation of HAL in 2010.
That would be 2001: A Space Odyssey when HAL sang that. 2010 was the sequel.