What percent of your bitcoins are on an exchange?

[bitcoinbear]

How reliant on exchanges are you with your bitcoins?

Where do you keep your bitcoins? (On exchanges, other webwallets, on your computer, paper wallet)

How much do you trust your exchange or webwallet to keep your bitcoins safe?

[TangibleCryptography]

0% (or minimum necessary to rebalance our portfolio).  The return of the principal is more important then the return on the principal.

The same rational is why we don't accept or hold client funds (except at the point of sale).

[niko]

Only a little bit more than what is necessary for me to do what I need to do. Having said that, I am comfortable with MtGox and VirtEx, and with two-factor authorization even more so.

[n8rwJeTt8TrrLKPa55eU]

3%

[nobbynobbynoob]

Just the minimum needed for trading purposes. Sometimes that amount is zero.

As a, ahem, poor man, I don't possess that many BTC anyway, but if somehow I ever do, they'll be worming their way into an offline wallet somewhere.

[spndr7]

100 % full risk cause don't have enough bandwidth and patience to download huge bitcion blockchain. After the mybitcoin scam no online wallet could be trusted.

[niko]

Exchanges I use have been around for a while, are registered businesses with authorities, and names of at least some people involved are known. In some ways, I trust their security practices more than my own. If you are going to tell me "told you so" if one of them disappears with the coins, be prepared to tell me "told you so" if my local machine gets compromised, or my wife runs away after sweeping the paper wallets, or I forget the brainwallet passphrase. The point being, no btc storage is 100% secure for an average user. We all weigh our risks, based on our IQ, knowledge, and the ability to judge them.

[DannyHamilton]

100 % . . . After the mybitcoin scam no online wallet could be trusted.

So that is why you store them in mtGox online wallet?  I don't understand your reasoning.