Is Double Spending Unconfirmed Transactions a Concern for Bitcoin?

Is Double Spending Unconfirmed Transactions a Concern for Bitcoin? (via http://bitcoinnewsbrief.com)

One of the key reasons that bitcoin has become a popular form of value, to the tune of $6bn, is that it has largely solved the double-spending problem that plagued other digital currencies before it. Interestingly, this double-spending problem isn’…