Hello. I am an avid "doubler" / ponzi player. There are several rounds active right now, that you might want to give some attention to:
http://bitcoinsurf.net/kingofthemountain/ - weeklong round ends tomorrow, but the last person in gets the remaining pot, so several people tend to get in at the end, therefore paying off earlier players.
http://www.multiplymybtc.com/ - round just started a few hours ago
http://bitcat.ch/ - very active game - round started 2/5 hours ago.
All three of these games have paid me out, week after week. The operators are honest and active on the forums. I can recommend them without hesitation.
What other doubler / ponzi / pyramid games do you like?
