If you often sit at a Windows PC but need to transfer files to or from a Linux box or Mac using SCP (Secure Copy), you definitely want to consider using the Open Source...

WinSCP 4.0.3

I've been using this for a couple of years now and it is definitely in my must-have list (Hmm, guess I should create an actual list for this site :-). This most recent version was released just last month on July 12.