At the moment adding support for multiple blogs to wordpress seems to be a rather convoluted affair. I own my own domain and have one main sub domain where my own blog is currently hosted. It would be nice to be able to create other blogs on other subdomains without so much mucking around, even if all the management tool does is create a seperate copy of the scripts and database tables for those other blogs, and without the need for me to personally copy stuff around first.
I've also noticed that there are a large number of requests in the server access log for wp-login.php, and these definitely were not caused by me. I can only assume that this was a crude attempt to hack my site (I don't allow users to register on my site so there is no legitimate reason that I know of why somebody else should be accessing this).
All the same it would be nice to have a basic logging system added to wordpress to log the IP address of those requesting the wp-login.php file. Perhaps have a unique list of IP addresses and the number of times that a request has been made from that address within a given time period so that you don't end up with a table that ends up being too big?