Best Online Wallet (IYO)

[n3yne]

I personally use blockchain, but I don't keep many bitcoins in it (under .1 BTC) I would recommend the flash drive idea for keeping your wallet secure. Use truecrypt on the flash drive to keep it extra secure.

[marcovaldo]

You don't even need an USB wallet.
You can create a paper wallet: https://www.bitaddress.org/ and send your fund there, by keeping the private key secrete...

[suppeoples]

Coinbase is probably the easiest one to use, but inputs.io is really good for security. I've never seen a website with more security than theirs. I only heard about Bitcoins recently so I don't have much to tell about past experiences, but making sure your wallet is secure is probably the biggest priority. Other people are saying blockchain.info is better for security than inputs.io, so I'd check them out, but to have more security than that is ridiculous.

[ainghia1308]

coinbase.com

[miffman]

I take back what I said. blockchain.info works occasionally