In any way there're some strange problems with the BlogEngine at the moment ... I already got used to edit them again, as soon as I published them from the live-writer, to remove the "tags:" writing, but there seems to be also a problem with the IDs, because from time to time the entries seem to be duplicated... Or - much worse: I just got home and the newest entry was gone.
Fortunately the Live-Writer had cached a copy of the entry, so it saved me the time for writing it again.
I'll keep track of that ...
[UPDATE 20.01.2008] It simply seems to be the LiveWriter, because everytime I post anything - and even if i'm instantly changing the page after the post, there're two entries created. I've posted an issue about that on Codeplex.