I'll be participating on a panel at the OReilly Open Source conference at the end of the month.  The panel is on open source software in government.  I've always been a big believer in open source and have tied to introduce it in my organization as we can. 

A good example is snort, an intrusion detection tool.  We were going to pay someone a lot of money for something not half as good simply because there was an assumption that the open source software somehow "wasn't acceptable."