I'm using the "read here right now" plugin, which dynamically adds content to the page. I'm also using Lightbox, which initializes when the "ready" method fires. So any new images injected by RHRN don't get the Lightbox treatment.
The author of RHRN suggests that plugin authors can use the '.live' method of jquery >1.4 to re-init when new content is added, but I can't find any good documentation on how to actually do that.