yes i agree, this is definatley not spamming, but much more showing someone a real opportunity just for them. Also, I find that companies often really appreciate being told about the opportunity even if it's not for them this time. If you think about it, it makes them feel good that you've done your research.
but - i still can go into "sales mode" a bit with these emails, and would be great to exchange some ideas about what has worked and what hasnt worked to date.