Below are some interesting Easter Eggs for Assassin's Creed: Brotherhood.

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Lucy's Facebook
If you exit the animus, walk over to Lucy's desk and look at the monitor on the right, Lucy is playing the facebook game Assassin's Creed: Legacy. I guess she wants to be an assassin too!

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.. .- -- .- .-.. .. ...- .
The achievement for Assassin's Creed: Brotherhood named ".. .- -- .- .-.. .. ...- ." is in fact Morse Code, and translates to "IAMALIVE".

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Unlockable Cheats For Use In Replays
Below are the names of the cheats that you can unlock for achieving total syncronisation on the relevant sequence.

Ride The Unicorn: Get 100% Total Synch in Sequence 1.
Buns Of Steel: Get 100% Total Synch in Sequence 2.
Killing Spree: Get 100% Total Synch in Sequence 3.
Sisterhood: Get 100% Total Synch in Sequence 4.
Ultimate Guild: Get 100% Total Synch in Sequence 5.
Unlimited Assassin Signals: Get 100% Total Synch in Sequence 6.
Desmond Everywhere: Get 100% Total Synch in Sequence 8.