From the publisher's website:

It's said that psychic powers are as intuitive as walking and talking. GURPS Psionic Powers went a long way toward making this true for gaming, speeding up the process of creating a psionic hero by doing all the math for you and explaining how the game mechanics work. GURPS Psis takes the next step, offering:

• A dozen templates for important psionic archetypes found in fiction, each with plenty of flexibility and open "slots" for your choice of psi capabilities.
  
• Over 100 different 25-, 50-, and 100-point sets of complementary psionic abilities, perks, skills, and techniques, ready to use on their own or with the templates.
  
• Plenty of advice to help you fit your gifts to your role . . . along with tricks to simplify how your powers appear on your character sheet and work in play.
  
• Notes on especially appropriate non-psionic advantages, disadvantages, and skills that can fill in the blanks for any psi.

It makes things so easy, it will seem like we read your mind . . .