We launch the seventh D: All Things Digital conference in Carlsbad, Calif., today, after a long weekend of preparations and way too many meetings, as you can see in the video below.

(Including packing the swag bags for attendees, upon which one of my kids sits in this photo.)

The conference kicks off with an evening interview tonight with Twitter co-founders Biz Stone and Evan Williams.

Walt Mossberg and I will be asking the pair about everything from their business plans for the hot microblogging service to the huge hype around their start-up to the state of innovation in Silicon Valley to what they plan to do next.

BoomTown will update after the interview, but you can follow the proceedings–in live blogs and video–as they happen on our All Things Digital D7 site here, so check early and often, starting at about 6:30 p.m. PDT.

Here’s the final prep video, including several meetings Walt and I attended today, a view of the ballroom being outfitted and another movie review–we took the staff to see “Terminator Salvation” last night to get pumped–by my annoying geek brother: