One of the biggest stepping stones to discovering the wonders of open source solutions is misinformation. Not intentional mind you, but a lack of easily accessible quality data on how and why to use open source for your needs.
There are some great places to start. For instance, you can run Linux from CD on your current Windows workstation. This is a great way to see what Linux and open source applications are all about.
Try this as a starting point:
Knoppix – http://knoppix.net/
For a central site to review Linux and open source news as well as vast amounts of user commentary, downloads and how-tos, see the Open Source Development Network at http://www.osdn.com