freebitco.in (shameless referral link) also offers a 4.08% interest rate on BTC held in their faucet wallet. I wouldn't advise putting all your eggs in one basket since you don't control the keys, but so far this wallet has been honest, open, and functional while others have all fallen by the wayside. I get around 500 Satoshis per day to HODL.
Yeah, I don't put my coins in a place where I don't control the keys. I know they have been honest, hence the oldest running faucet service. But, sometimes, it doesn't have to be a malicious act to cause you grief.
But yeah, I have used them for a while. It's been good getting out some 30K Sats every now and then.