A great new feature added to eBird is the ability to add photos to your checklists.
Using the HTML IMG tag, you are allowed to link and display an image from your online photo gallery, whether from Flickr, Picasaweb, or other web sites. eBird asks you to restrict your photos to about 400x400 pixels.
These show up when displaying checklists. For instance, if you go to eBird and the "View and Explore Data" tab, "Range and Point Maps," and type in "Green Heron," selecting November 2011. You can see the map of sightings and zoom into NW Oregon area. Click on the flag in the Beaverton area and the details of my 11-15-2011 sighting from Commonwealth Lake. Then click on the checklist link.
Up pops my checklist for the day with several embedded photos, including the Green Heron.
For more details, see the eBird site and the article eBird Update--Now embed photos in your checklists!