I've migrated this website to Drupal 7. Migration process was quite easy and straightforward; in fact, I'm impressed with quality of work that Drupal folks did to achieve this level of quality. But I still need some time to configure the stuff up and have it working.
I also made some important decisions about this blog. First of all, despite of my weak english, I won't write anything in polish. It will be a good training of my language skills :).