the_post_image() = the_post_thumbnail()
This is to let you fellow lost souls out there know that the new the_post_image() functionality that was announced for WordPress 2.9 was subsequently renamed the_post_thumbnail(). This was not immediately apparent—I guess since it was never in an official release that way, it doesn’t have to be shown as a deprecated function.
Check back soon for a post on using the darn thing!