As I was growing rather tired of my previous theme, I decided to download and install a new one.
After some searching my heart was conquered by 'newswire'. I like the minimalism, I like the colours and I like the possibility to modify my blocks.
One problem with the new theme: gravatars do currently not work, but I'm keeping an eye on: http://drupal.org/node/364949 to fix this :-)
UPDATE:
Apparently, thx to my posting on the gravatar issue Dave Reid was able to suggest a fix that works, now finaly gravatars work again.
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