One of the big critiques of WordPress is so many blogs look the same. The release of WP 1.5 should go a long way to solving this issue as the user install of themes is now just a matter of clicking a link.
I think we’ll see a lot more themes around now and that is great for WP. Take a look at the above list for example, WP 1.5 has been out only a few weeks and there are already over 200 downloadable themes for it; all for free.
Also see the theme competition over at alexking – themes are easy to download over there.