I have an unconfirmed transaction and/or it is confirming super slow. What should I do?

Be patient and wait. The transaction should confirm within 5 days. If it does not, tell the sender to resend with a fee. Do not ship goods without at least 1 confirmation. Please do not ask for help; it will not speed up confirmations. Blockchain.info says it should be confirmed by now, but it is still not confirmed!

Blockchain.info's confirmation time is just a guess. Confirmation times may vary wildly, so do not be concerned when your confirmation time is long. Sit tight and your transaction will confirm. How can I speed up confirmation in the future?

Get the sender to pay at least 0.0001 BTC per kB in transaction fees. How does Bitcoin's fee policy work?

Transaction fees are based on the size of the transaction. Sending to many recipients, or sending from a wallet that received "dust" transactions will increase transaction size. How much fee you pay matters as well; 0.001 btc/kb will confirm within the next block whereas 0.0001 may take several blocks. These policies are in place to prevent large blocks (bad for miners) and transaction spam (bad for everyone running a full node). How do I resend a transaction?

Bitcoin-qt will rebroadcast unconfirmed transactions every 30 minutes or so. As long as the sender has his client open, the transaction will be rebroadcast. How do I resend a transaction with extra fee?

Bitcoin-qt users:

Delete the transaction from your wallet
Wait 48-72 hours so the network can "forget" the transaction (this step is very important!)
Send the coins again with a fee

Third party client users How do I remove an unconfirmed transaction?

If you do not want to see the unconfirmed transaction, you can remove the transaction from your wallet. Once the transaction gets confirmed, it will reappear in your wallet.