Since there has been a small measure of confusion here lately about what EXACTLY factors into rep, here is a basic run down.
Every 50 days of membership = 1 rep power
Every 600 posts = 1 rep power
Every 400 points of rep points earned = 1 rep power (obviously with higher rep'd people the points given to him will be higher)
25 posts must be made before that user can give rep points and have it count towards the other members count.
35 points of rep points (not rep power) must be had by a member before any rep can be given to count.