While TEP knows alot about Behr's writings (actually Shackelford is the real expert on him, TN as well), I can give you a modest run down on his courses.
Rancho Santa Fe GC- changed by a few architects over the years with the last being Dave Fleming before the U.S Junior Amateur.
Victoria Club- Robert Ball can give a great rundown on this club. Great stuff still there and definitely his best surviing example. It's had some changes by others, but it's still has noteworthy features. The 15th there is one of the few Alps in California.
Montecito CC- Heavily changed and not much Max Behr left after HWY 101 encroached upon the property. Jon Spaulding played there fairly recently and give a better description
Montebello- Still had a decent amount of Behr's work left until just a few years ago when most (if not all) the greens changed and most of the bunkers. I believe the routing is somewhat the same.
Oakmont- Also changed quite a bit and getting ready to renovate(Schmidt/Curley). I'll be playing there at the end of the month and will present some photos before the work commences.
Meadowlark (formerly Long Beach CC)- Has been shortened and lost some it's features, but still has some quirky stuff you don't see typically in So Cal. Long hitters can shoot it to pieces today (under 6000 yds)
Lakeside- Possibly his greatest course in it's original form. Big man made sand dunes can be seen in old aerials and photos. Some of Bobby Jones instructional moviers were filmed there. Heavy flooding destroyed much of the course and subsequent changes leave little of Behr's work there.
There are others as well that Tommy N knows very well. I beleive there was El Segundo and Sepulveda (I may be wrong in remembering these two, they could be Bell NLE's) and the California pay-as-you-pay Club. I'm not sure the extent of his involvement on consulting on some work done at Olympic Club. He was a member at Wilshire and I believe Brentwood as well (and a few others). Unfortuantely, like alot of other GA archs, most of his work has been mauled.