I came across WinSCP (Secure Copy Protocol for Windows). This was very easy to install and run, and it works great! You can easily download it free from winscp.net. Here is a screenshot of the setup window:
I just ignored the Private key file and Select color options as I don't know what they are for. When you click Login, you get a screen like this:
It's magic! On the left pane are my PC files and on the right, the Pi's files. That's pretty impressive, as the PC is on Windows, and the Pi is on Linux. To transfer files from one machine to the other, you can drag 'n drop or highlight and move - brilliant! If you look carefully, you'll see a series of files on the Pi named a_00001_1min.jpg to a_00010_1min.jpg. These are my very first attempt at time lapse photography and I'll tell you more about these below.
I got the instructions from the very helpful Alex Eames of RasPiTV at http://raspi.tv/tag/raspicam-nine-day-time-lapse-video
So to get a 1-minute time lapse sequence of jpegs, each representing a 6 second interval, I ran the following command: