Thomas Hawk has a great writeup on how to get more attention for your photos on Flickr.
I’m not suggesting you engage in a furious effort of self-promotion, but his suggestions for tagging, posting, and other things are really quite useful and relevant, no matter how esoteric the subject matter (like origami tessellations, for instance).
I think his suggestions about tagging are really the best, and most important- the more descriptive and useful tags your photos have, the more likely they are to be found. That can be either through flickr, through tag-browsing engines like Technorati or others, or through search engines like Google. It’s a positive thing all around. Good descriptive text and titles is also quite helpful, too.
Anyhow, here’s the link: