The only way I can find to delete a blog entry is by clicking on it via the Recently Updated list in the Space Summary. This is the only way I can get the edit and delete icons to appear. Judging from the links generated, it looks like most of the ways of getting to a blog entry show the entries for a certain day and not a specific entry.

It would be nice to have at least a link on each individual blog entry that would take you to the edit/delete page for that entry, or even better, to have icons associated with each entry for the entry creator and space admins.

I could be wrong about this, but I spent hours trying to figure this out and this is all I could come up with.