had to make some changes as I was not using the GAE datastore's key properly, as I thouhgt I didn't need it, but I do, so I set that up, and made some changes to other parts of the code to reflect that (I think it should result in less queries).
added functionality to delete posts, this was mostly based on the previous key-adding exercise (as that's the only way to delete an entity) but I changed the flow around a little to make it a bit more friendly.  Also, JavaScript, woo.