Keith Brown blogs about some interesting-sounding security training modules he created which are now available at Microsoft’s Patterns and Practices.
Don’t know who Brown is? Go check out his amazing book The .NET Developer's Guide to Windows Security which is freely available via a Wiki. Look over the Wiki, and if you find it useful then be sure to spend some $$ and support both Addison-Wesley, the publisher who let him put the content out for free, and Brown himself.[Via Keith Brown]