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You can buy coffee cups, shirts and stuff like that at http://www.cafepress.com/sk/minetest
Forum thread: http://forum.minetest.net/viewtopic.php?id=4437
You can donate money to celeron55, to be used for:
If you think you would have good use for donation money, make sure celeron55 knows of it.
In case you'd prefer an european bank account number, send celeron55 an e-mail.