Member Serivces will take care of the "booking a week" for you. You just tell them what you would like to do and they will tell you how many points it will take.
As for what you can do with 150 points, there may not be as many choices. DVC states that most exchanges will require approx 230 points (Enough for a 1-BR in Magic Season for a week.) Hence the disclosure in the advertising material.
I have heard tell though of people getting Hawaii for less than 230 for the week.
Disney Vacation Club Board Co-Moderator DVC and Cruise Chat Hostess Cruise Board List Mistress
<font size=4 color=blue font face="Comic Sans MS">Robin