My collection of astronaunt signatures currently consists of:

Alan Shepard (first american in space) - Mercury 7, Apollo 14 Moonwalker

Gus Grissom - Mercury 7, Gemini 3, Apollo 1

John Glenn - Mercury 7

Scott Carpenter - Mercury 7

Walter Cunningham - Mercury 7, Gemini 6, Apollo 7

Gordon Cooper - Mercury 7, Gemini 5

Deke Slayton - Mercury 7, Apollo/Soyuz, Astronaut Director: All Mercury, Gemini, and Apollo missions.

Neil Armstrong (first man on the moon) - Gemini 8, Apollo 11 Moonwalker

Buzz Aldrin - Gemini 12, Apollo 11 Moonwalker

Richard Gordon - Gemini 11, Apollo 12

John Young - Gemini 3, Gemini 10, Apollo 10, Apollo 16 Moonwalker, (Space Shuttle) STS-1, STS-9/Skylab 1 (Thanks Norm!)

Gene Cernan (last man on the moon) - Gemini 9- A, Apollo 10, Apollo 17 Moonwalker

Gene Kranz - Flight Director for NASA: Mercury, Gemini, and Apollo Missions