There is a signature campaign paid in bitcoin but the thread is opened at Bounties section, so I think it can be added to the table.
Link:
ReferCoins: Easiest Way to Earn BTCPayment rate:
Hero/Legendary: 0.005 BTC
Sr. Member/Full Member: 0.0026 BTC
Member/Jr. Member: 0.0015 BTC
[tr]
[td]|[/td]
[td][url=https://bitcointalk.org/index.php?topic=5254523.0]Refercoins[/url][/td][td]|[/td]
[td]f/w[/td][td]|[/td]
[td].005[/td][td]|[/td]
[td].0026[/td][td]|[/td]
[td].0015[/td][td]|[/td]
[td]x[/td][td]|[/td]
[td]x[/td][td]|[/td]
[td]x[/td][td]|[/td]
[td]15/w[/td][td]|[/td][td]60/w[/td][td]|[/td]
[td]N[/td][td]|[/td]
[/tr]
Notes:
- Application should be done on the website of refercoins
- Status no open slots and PNYC
- There is a 10% fee of the earning as explained
here