The Open Web Application Security Project is an international community of people focused on improving application security. Their work, including a great set of tools, is available for free under an open source license. You can read all about OWASP at their web site. Take a look, play with some of the tools, and then join in.
For folks in and around Eugene, Oregon, we're kicking off a local OWASP Chapter. Local chapters are all about learning and networking. No sales. No vendor pitches. The meetings are going to be a great way to spend a fun evening with folks who are interested in software security, hacks, and defenses.
If you're in the area feel free to drop by. Meeting times and locations will be announced on the Chapter web site, and on the mailing list. The mailing list is also a great place to suggest topics you'd like covered at the meetings or to ask application security questions.
Hope to see you there.