i've been looking at a few schools for 2010 to add more to my portfolio, including this one...

This is the first year Berkeley is offering their summer program, which might explain the relative lack of info. Even if all the kinks aren't quite worked out, it would probably still be a good experience.

hmm.. Cal did not have this program two years ago when I graduated, but looking at its weekly schedule and components, it looks more exciting than just regular summer studios, which meet on M-W-Th without two additional components.
Though this program might be differ from ordinary summer studios, I can tell you little bit about studio structure.

There are approximately 60-75 people in summer studio that, I believe, randomly distributes students to 5-6 small sections. Each section has section instructor who will determine your studio experience. Lectures are given by all or most of these instructors. When there aren't lectures, teachers come in during studio time to give you desk crits, pin-ups, and group reviews.

Though assignments are varied from instructor to instructor, you'll make a lot of conceptual models and diagrams. I'd say learn at least anyCAD, photoshop and illustrator early on to help with these assignments. This program does offer tech session to teach you programs but tutorials tend to move pretty fast and you'll have to make a lot of effort to catch up.

i did UCLA's summer program (Jump Start), which i'm assuming would be fairly similar to Cal's.

it comprised of three courses, 13 units:
history of architecture
intro to representation (we learned hand drafting, rhino, and illustrator)
studio

we also had workshops, field trips to significant architectural landmarks, and guest lectures, so we were pretty much booked from 9AM to 6PM (and occasionally even later) every single day.

most of us spent many nights (not) sleeping in the studio in vain attempts to finish the two major studio projects.

it was difficult and stressful, but definitely a great intro to architecture. also a very good way to find out what architecture school might actually be like.

also got two great portfolio-building projects out of it.