Add your photo to a couple dozen groups. If it's a really good photo, it might get 100+ views, but within minutes other people's photos have pushed yours off the groups' front pages and it will never be seen again.
A few hours later, when on your photo's page, press G to see a list of groups it's in. Click the X to the right of each group to remove the photo from the group, and then click to add the photo back to the group. The photo will move to the top of the group's gallery and get even more views. With Flickr's new system, this can be done within a minute.
It's an asshole way to promote your work but it's effective