WordPress 1.5
I just upgraded to WordPress 1.5. One of the most outstanding upgrades, IMO, is the new theme manager. With the click of a button I can switch between themes. The default theme is now Kubrick…the theme that I’m using can be found at the bottom of the page. I still have some tweaking to do (such has making the javascript menu on the left work correctly), but all-in-all I really like the look of this theme. It does seem a little washed out to me so I might enlarge the fonts a little bit and bolden the colors…
Back to biomolecular chemistry studying. 
I may just upgrade to 1.5 like you suggested to me on my site. Is it simply uploading some new files?
Yes. It is extremely easy to upgrade. Just download 1.5, make sure to backup any changes that you made that you want to save, and then just copy the files to your wordpress directory. To upgrade just go to http://yoursite.com/wordpress/wp-admin/upgrade.php.
Themes are much easier to use and the built-in spam protection is very good.
Good luck!