which of these are most worth it?
IMHO, the 777coin one (https://bitcointalk.org/index.php?topic=254871.0, 0.0001 btc daily, no requirement on activity) and the scratch ticket one (https://bitcointalk.org/index.php?topic=467870.0, 0.0015 btc, 30+ activity) are the best on-going giveaway.
