It is tempting to deposit a lot of coins into Freebitco.in to receive the interest, but it is very risky.
I will only deposit an amount of money into this site that I am comfortable to lose, in the event that something goes wrong. Freebitco.in has a very good track record for security and their cold storage strategy is very good, but it is still more risky than the options I mentioned.
That's good advice. If you don't own the private key you don't own the Bitcoin as the saying goes. We've been around for over 5 years and earned our reputation for being trustworthy and secure. Before working for freebitco.in I used to have a small part of my Bitcoins earning interest here as well as some invested elsewhere, but always keep the majority in my own wallets.
What I would advise against though is depositing funds and then signing up a load of fake referrals to claim multiple free-rolls every hour.