KVR Audio: A database of the latest plugins for every DAW (Digital Audio Workstation) including reviews, commercial and free releases
Beatport: A large resource of new electronic music, DJ mixes, remixes and sample packs http://www.beatport.com/
Juno Records: One of the largest online record shops specialising in electronic music of various genres
SoundCloud: A platform for artists new and commercial to showcase their material. They have both free and subscribed accounts
Mixcloud: A platform for all DJs to showcase their mixes. A track listing shows what tracks are in the mix and links to where they can be purchased
Remix Comps: An online resource for finding and entering remix competitions
Resident Advisor: An online magazine for electronic musicians & DJs with info on releases, venue dates and dj and artist information
Gear Slutz: A forum all about the latest music equipment and tips.
Production Advice: Get some short, handy hints straight to your inbox!
Music Tech Tutorials: A collection of tutorial videos from around the web
Sound Collabs: Find musicians to collaborate with on your next project.
Music Marketing: A blog all about how to begin selling and marketing your music
Massive Synth Tutorials: Tutorials for Native Instruments products and software
Who Sampled: Find out the samples used for a particular track
Discogs: An online database of commercial music with a marketplace for tracking down that elusive extended 12" version with that drum break on it.