This trade collects Silver Surfer issues #34-38, The Thanos Quest Books 1&2, and a six page story from Logan's Run issue #6.
Rebirth of Thanos collects the events leading up to Marvel's classic universe spanning crossover, The Infinity Gauntlet. The Mistress Death has observed what she believes to be a cosmic imbalance and has her most dangerous servant resurrected to correct it. They believe only one obstacle can impede his success: the Silver Surfer.
The Silver Surfer issues provide interesting but not entirely necessary background explaining Thanos's goals and motivations as well as the Surfer's first attempts to stem the Titan's mad plans. It's a bit uneven blend of drama and humor (looking at you, Impossible Man) but Starlin was laying groundwork here for something bigger, and the insight provided and glimpses of characters such as Thanos's family (Nebula, Mentor and Eros) and Drax the Destroyer sets the stage nicely for the saga of the Infinity Gems.
The Thanos Quest follows Thanos as he attempts to collect all six gems from beings known as the Elders. It adds great depth to the events that follow and is great in it's own right. From my review of the individual issues: "Jim Starlin and Ron Lim were a fantastic team, and well known for their work in the cosmic corners of the Marvel U. Thanos is a particularly interesting villain: incredibly powerful, but brilliant, ambitious and devious beyond measure to boot. Starlin makes his search for ultimate power compelling, and Lim's art, while a different style than that of today, is excellent none-the-less."
The Final Flower is really a throw away story and since it focuses on a version of Drax the Destroyer who is somewhat different from the one in the rest of the trade, is relatively pointless as well.
Overall Rebirth is a great collection of cosmic adventures that build the stakes nicely for The Infinity Gauntlet. The rest of the material isn't quite as strong as The Thanos Quest (one of my all time favorite stories) but is still solid, and as Quest is long out of print in any other format this trade is easily worth picking up.