I visited my blog today after a really long time of inactivity and
> found some one has gotten in and posted things in Polish.
When I deleted the posts - updated my plug ins and my whole blog fell apart.
Visited blog two days later and theme was back up with another Polish post - Amster8881 is his name. Deleted his post and again theme collapsed.
This time I went in and deleted him from registered users and any other admin type - and changed the password.
Probably not enough to keep him out?