GnuPG, in its various guises, can be downloaded from GnuPG.org.
My public key, as of 27th October, 2011, is:
-----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v2.0.12 (MingW32) mQGiBEjT0w4RBADoynrVPMeBY0HQhG3eodjr25QQUgccPGnR5KZBn7A5iFvlox6w xFmMesS8Jw1Qiw4M/0yXvZhBBiaRGWlYsIIq2wxaausQ2iVrXusbEy+gAqcFLPXP cVBUlZZ3+udVQZ598ZONZQd1Pc6dfNuwEIg5jvap9I2oyfjPubILaRzpgwCgprb9 x/+AnAKlkQGVvplpovp/0TsEAMQq6N5BPROTnjnE2oHN5b/nBSxKdWRg9jqJAbjW OCHl3RkXtH3ZZ0z92lthQVHHuB9Boz+F5h+jhPOi/bql15o5kiiNWqcdz1Hd5yu3 w4QHcssmgZFRX/onjBjW6XJop4V6pQ32imw/XqFLm6Js6Ro2OOsCGGco+SKTzXzS /l32BADlrudsZB6SgzfjsOpOBilj8IMEFfCKt0MFMu/h9OELrD8sEnV1n9rv3xq2 ql1OY4kOdISafqRqUy0EQFWwFf/h74BsQndAfr3IUygNSmB7ASP/ahxk0clkv9Mh jXiwEhlwu0u45x3MqVMPnCvZm/2Uw5RUoxhLqhfKRxBQ5X51lbQnQ2hyaXN0b3Bo ZXIgSGFycmlzb24gKFhvcGgpIDxjQHhvcGguY28+iGUEExEIACUCGwMGCwkIBwMC BhUIAgkKCwQWAgMBAh4BAheABQJOk07lAhkBAAoJELnA1bkseOUt6zEAn1l0qH58 JBMSCp/7M/+iC2zdV9IUAJ4rZULSNw5yJOL13zisSlzWqwSm57RBQ2hyaXN0b3Bo ZXIgSGFycmlzb24gKE1BIExpbmd1aXN0aWNzIDIwMDkvMTApIDx1Y2p0Y2hoQHVj bC5hYy51az6IYgQTEQgAIgIbAwYLCQgHAwIGFQgCCQoLBBYCAwECHgECF4AFAk6T TuQACgkQucDVuSx45S3h4wCeLUWnse21hgp/0XSDZyOvfN7vYeUAninWjVMr3KBf ddGhOmjcnbV37LJttDtDaHJpc3RvcGhlciBIYXJyaXNvbiAoWG9jb2xhdGwpIDxD aHJpc0BDaW9jY29sYXRlcmlhLmNvLnVrPohmBDARCAAmBQJOqJSgHx0gY2lvY2Nv bGF0ZXJpYS5jby51ayBjYW5jZWxsZWQACgkQucDVuSx45S3VDwCcCMhO4U/dkaVj z7ShlotehesIXqgAn1b4DY9r2JMFyhAPOGHpstHtXN0OuQINBEjT0w4QCACfrtMv GefbECka75NGivoL9LTC7k2eCFpZgIQ3W52/UOiU6NTemY4wYLrSy6ycH0I6Apay 8abheFbM195ZZXkFhP0+39EmAxsQE4cURlL+LeFnwmySPEyEVLfxAP+T4QWLgq2o 6vCFqr1yumWrzdM2yLtm4NxtJkInBHoDlKIg0Lq1cJ70Yyw2T93bngG7lC0FfI4b R2odzdejOsb5H7oWMCcoY0F9GEBrrrnOPiUrDOxp4Yex3x02xLeOYmbzm1n99IU4 3MpudDq+nn4faNrwvjUCJEaN41QrEKV8QQKaaAD6uyEwQ25Yf8LDqVyqmY9NPHYb cqsxF1OAgEUMGr//AAMFB/4ryh+ODNdyekBPTUuiV0x8QCc6tzmcb6kQpBNUJqm0 1e9bAY+EBkzSeMGGueoGbsuDRnds+rNUuUr3l/OCeaIW6oSBJ0DVD1jmm5jhDOrm tSveqposRaNcIOy3D5zTRhOsPyGpINxsBMrX3uK9NvXhOSSFvcZc9WV+baCyUVXQ nYYtrMbnqVJtRK2OxVJfV+Lwz4g5S+vdb+po1AsNjHRP65kgFaGVXtl1ZbdPptbL yzNaeIgvxm1smpaW0dthWfveHF9SzEUQ7Y1BwhmzIpqgV5m4eBO3COI9J3uBaNYu ZbyNHXXPmY0rX5V6YU4PLSm+QRJsQB40xNv+XTbIaOL8iEkEGBECAAkFAkjT0w4C GwwACgkQucDVuSx45S1tvwCgmupulet9yvoWvmejomljDXnD0dwAn3kugXv9BMm7 UjKp9hnE61aNTwk8 =JHWn -----END PGP PUBLIC KEY BLOCK-----