One main challenge in identifying highly energetic massive particles that decay into hadrons is that the decay products become increasingly collimated. I will discuss previous studies on high-pt jets for highly boosted massive particles such as the top, W/Z and Higgs; and howwe can exploit the different patterns of energy flow todistinguishthem from jets from light quarks and gluons.I will also discuss how suchobservables may play a role in understanding current anomalies atthe Tevatron.

IPhT