For personal stuff, I’m firstname.lastname@example.org. I generally see email quickly, but don’t usually reply except when sitting at a desk, so give it a few hours.
I’m on Twitter as @xor, and a few other places too.
For work-related inquiries, you can find my contact information (including my public key) on my EFF staff page. My work and personal inboxes are separate, and it’s easier for me to keep them that way.
For EFF-related press inquiries, the fastest method is to email email@example.com. They’ll put you in touch with the right person, even if it’s not me. If you’d like to contact EFF about anything else, including legal questions, it’s best to email firstname.lastname@example.org.