Mid-City Community Music - Private lessons, group lessons, guitar jams and meetups for musicians and music students in the mid-city area of San Diego, CA.
openmikes.org - The craigslist of open mic events in the US and Canada. This is a great resource for touring musicians to fill a static night on the road or for musicians to find open mic in their new home town.
Gig Town - A way for local, independent artists and bands to find paying gigs. Gig Town is an app and another, new way for musicians and venues to interact (in a slightly more balanced way).
discchord.com - A great stop-in on the web for music app news, reviews and tutorials. I've used discchord whenever I've downloaded a new app and I feel impatient about getting the skinny on all the features!
Listen Local - One of San Diego's longest standing independent music shows, featuring artists and bands from the San Diego independent music scene.
subreel.com - Subreel is a music blog that offers tips, product reviews and guides for musicians who are looking for perspectives in music and in the studio.