For further information on the issue in the extension powermail, please read the related advisory TYPO3-SA-2010-019 that was published today:
http://typo3.org/teams/security/security-bulletins/typo3-sa-2010-019/
TYPO3 Surfcamp 2024
Young developers Lisa-Maria Schedlberger & Julia Gruber share their first-hand experience of fun-in-the-sun at TYPO3 Surfcamp.