Follow up to phone interview?

[dettu]

What's the protocol here? I had a "courtesy interview" today. The recruiter did NOT mention to me that a) she meant to do the interview over the phone and b) she was not at the same location where she's worked up until last Friday, so when I went to what I thought was her location, there was some flustered scurrying around amongst the staff and finally they put me in a conference room so I could talk to her on the phone!

It was just a very general interview, what are my strengths, what kind of work do I do, etc. They have no positions open for me, so I was just trying to give a positive impression and get my resume into their file for the time when positions do open.

I should follow up, but what's appropriate? All of our previous communications were by email, and this is an IT networks company - and at the moment I don't even know where she's physically located! Would a short email thanking her for her time be sufficient?

[gee4]

Yes of course.  The fact that you turned up in person showed how keen you were.  A follow up by email will do no harm.