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Bitcoin New transactions can be discovered by polling using the listsinceblock API command with the Bitcoin.org client.

Beginning with v0.8.2 of the Bitcoin-Qt/bitcoind client is -walletnotify option that can run a process when a transaction that affects the wallet is seen.

The BitsOfProof supernode will offer this as well I believe.

[Update: Thanks to Pelle's answer to a related question,

You can do this using BitcoinJ by implementing the PeerEventListener interface.

The OnTransaction will be called every time a new Transaction is broadcast out and received from a Peer ]

Bitcoin New transactions can be discovered by polling using the listsinceblock API command with the Bitcoin.org client.

Beginning with v0.8.2 of the Bitcoin-Qt/bitcoind client is -walletnotify option that can run a process when a transaction that affects the wallet is seen.

The BitsOfProof supernode will offer this as well I believe.

[Update: Thanks to Pelle's answer to a related question,

You can do this using BitcoinJ by implementing the PeerEventListener interface.

The OnTransaction will be called every time a new Transaction is broadcast out and received from a Peer ]

New transactions can be discovered by polling using the listsinceblock API command with the Bitcoin.org client.

The BitsOfProof supernode will offer this as well I believe.

[Update: Thanks to Pelle's answer to a related question,

You can do this using BitcoinJ by implementing the PeerEventListener interface.

The OnTransaction will be called every time a new Transaction is broadcast out and received from a Peer ]

Bitcoin New transactions can be discovered by polling using the listsinceblock API command with the Bitcoin.org client.

Beginning with v0.8.2 of the Bitcoin-Qt/bitcoind client is -walletnotify option that can run a process when a transaction that affects the wallet is seen.

The BitsOfProof supernode will offer this as well I believe.

[Update: Thanks to Pelle's answer to a related question,

You can do this using BitcoinJ by implementing the PeerEventListener interface.

The OnTransaction will be called every time a new Transaction is broadcast out and received from a Peer ]

New transactions can be discovered by polling using the listsinceblock API command with the Bitcoin.org client.

Other clients will have a callback. BitcoinJ does, I believe. The BitsOfProof supernode will offer this as well I believe.

New transactions can be discovered by polling using the listsinceblock API command with the Bitcoin.org client.

The BitsOfProof supernode will offer this as well I believe.

[Update: Thanks to Pelle's answer to a related question,

You can do this using BitcoinJ by implementing the PeerEventListener interface.

The OnTransaction will be called every time a new Transaction is broadcast out and received from a Peer ]