Bunch of links worth visiting:

Music:

• deejaydelta.prv.pl - a guy who makes drum and bass. Non-stop! :)
• mp3.pl - free music of polish artists

Painting:

• palucha.art.pl - funny, surrealistic paintings by Jacek Palucha
• setowski.art.pl - fantastic visions of fantasy worlds

Programming, internet:

• citeseer.nj.nec.com/cs - catalogue of science articles (DSP, IT, AI etc.)
• cyberfiszka.prv.pl - psychology of the web (PL)
• gamasutra.com - about making computer games, from the POV of it's designers
• php.faq.pl - PHP FAQ; many links (PL)

Synthesizers, DSP:

• musicdsp.org - articles about DSP
• romcio - Pole who constructed few fine synthesizers
• synth.clara.net/beginners.html - synthesizers DIY primer
• smartelectronix.com - weired VST plugins
• sonicstate.com - info about every (?) synthesizer
• tamw.atari-users.net/dx7.htm - hundreds of sysex files (could be used with Native Instruments FM-7)
• tobybear.de - page with mad VST plugins
• tyala.freeyellow.com - theory of music and FM synthesis
• vintagesynth.com - before you buy a synthesizer, look here
• www.u-he.com/vstsource/ - helpfull hints for all VST programmers

Others:

• 1 - gore animations featuring cuddly, animated animals
• 2 - before you go to an exotic country
• 3 - before you go on holidays in Uzbekistan
• 4 - colouring for kids (PL)
• 5 - if you have problems with identifying and naming colours :)
• 6 - start running; today! (PL)