Bitfinex lending is one of those, Poloniex also offers similar services, but there rate is lower and there are some issues associated with them.
I've exchanged some BTCs for LTC and the current going lending rate is 0.74% a day at Bitfinex. That should add up to some nice extra coins over a week or two, until Bitcoin picks up speed again.
BTC, ETH or XMR come not even close to Litecoin.
Please share your ideas!
I agree that the current lending rates for Litecoin are extremely attractive!
However, you should keep in mind that the interest rates are directly correlated to the amount
of opened LTC shorts (and the demand for additional short positions). LTC value will probably drop a lot and therefore
I´d strongly advise you to only take advantage of the high lending rates for LTC,
if you intend to keep your Litecoin for the long-term and are fine
with sitting out a prolonged bear market.