Agree with BigSnowball, it's not time wasted to go sequentially.  But since you asked, my faves:

#39 (Carlos Welch aka loxxii around these parts) – no explanation necessary, just listen. The follow up to this is #47

#42 (Faraz Jaka) – top, top notch strategy hand, very interesting interview

#26 (no guest) – great strategy hand from the WSOP, which they continue talking about in #27

#27-28 (Olivier Busquet) – really good interviews

#18 (Ike Haxton) – it's farking Ike Haxton

#2 and #29 (Tommy Angelo) – Tommy's the dogs bollocks of guests

#30 (Jussi Palomaki) – good discussion on tilt

#64 (John the Lawyer) – really fun interview

#25 (Ed Miller) – good learning here

#6, #15, #34, #41, #53 (Gareth Chantler) – I'm a Gareth fan boy, I'll admit it…though

#10, #23 & #56  (Leo Wolpert) – like the Gareth episodes, having a third guy on that the hosts have a really good rapport with makes for very good conversation

#16 (Killingbird) – I figure if I'm using the TPE forum to list my favorite episodes I'm obligated to put this one on