My top 5 list of favourite GPT sites:

1. ClixNCash - PTC
2. WebTradeHut forum - PTP
3. WebmasterMoney - PTP, hope will be paid soon
4. MakeMoneyKingdom - PTP, hope will be paid soon
5. TheClickers - PTC

I've been paid by them at least once, except when it says "hope will be paid soon" :P