Plus Clix (Brother Site of Earn BZ)

Pay per ad = up to $ 0.01
Min ads = 4 (standard)
Min to cashout = $ 4 (every 1st and 15th in the month)
Payout methods = instant (paypal and alertpay)

Earn BZ

Pay per ad = up to $ 0.01
Min ads = 4 (standard)
Min to cashout = $ 4 (first), $ 8 (every cashout after that)
Payout methods = instant (paypal and alertpay)

SN Bux

Pay per ad = up to $ 0.02
Min ads = 4 (standard)
Min to cashout = $ 3 (first), $ 5 (second), $ 7 (third), $ 9 (four), $ 10 (every cashout after that)
Payout methods = instant (paypal and alertpay)

Bux Plode

Pay per ad = $ 0.005-0.0125
Min ads = 4 (standard)
Min to cashout = $ 2 (first), $ 4 (second), $ 8 (third), $ 10 (every cashout after that)
Payout methods = instant (paypal and alertpay)

JP Bux

Pay per ad = up to $ 0.02
Min ads = 4 (standard)
Min to cashout = $ 2 (first), $ 4 (second), $ 6 (third), $ 8 (four), $ 10 (every cashout after that)
Payout methods = instant (paypal and alertpay)

Palm Bux

http://www.palmbux.com/images/banners/bannerv3.gif
Pay per ad = up to $ 0.02
Min ads = 4 (standard)
Min to cashout = $ 2 (first), $ 4 (second), $ 6 (third), $ 8 (every cashout after that)
Payout methods = instant (paypal and alertpay)

Trek Pay

Pay per ad = 1-3 credit

Min ads = 4

Min to cashout = $ 5.50

Payout methods = 2 weeks (paypal)