I am currently looking for a new job. For the last several months, I have been working in an office that puts me in close contact with a variety of organizations for which I would be interested in working. None of these organizations currently has open positions, but the people at each know me and know my work reasonably well. As my time in this position winds down, I am thinking of ways to express my interest in these organizations and wonder if sending a note expressing my interest + attaching my resume is a good idea. Have you ever done this? What was the response?

If you have ever received such a note, I would also be interested to hear how it was received.