The levels are as follows:
0-49 posts Starting Member
50-99 New Member (1 star)
100-199 Junior Member (2 stars)
200-499 Member (3 stars)
500-999 Senior Member (4 stars)
1000 or more Advanced Member (5 stars)
With each level you get a new star and the stars change color. Moderators (like Hal) don't have their labels change. Their label stays "Moderator" but they do get the additional stars.
Director, Applications & Support Services
Wiley Publishing, Inc.