Since I am on this bent about posting easily (blogger is ok, but I am not fond of the posting interface), I first have to admit that I don't have the kinks worked out of the posting directly from open office. So I will talk about posting from Thunderbird instead.
I have been doing this for about three weeks now. Seems to work fine. I can imbed links, and add pictures easily. There isn't much in the way of page layout, and you cannot make text wrap around pictures that I can figure out, but those things don't bother me.
Basically, just write what you want, send it to the e-mail address that you designate under the settings in the blogger program and off you go. Send the e-mail and it posts.
I have about four or five drafts sitting in my drafts folder in Thunderbird that will someday become posts. Works pretty dandy