a rather limited ragbag of links -

Sound on Sound - If you're at all interested in making music with samplers, synthesisers, sequencers etc then Sound on Sound is the definitive magazine.
The Project Studio Handbook - a stunning set of resources created by Matt Ottewill
The Synth Zone - If you want to find out more about a particular synth, or maybe pick up some advice or locate some new sounds, then the Synth  Zone is a very good place to start.
Wind and Wire - a music review site run by Bill Binkelman covering ambient, electronica and related genres of music.
Logic Pro X - absolutely my sequencer of choice. I've been using it since its original incarnation as "Creator" running on an Atari ST.
Lleyn Links - Links specific to the Lleyn Peninsula - but mostly just Aberdaron