I think I would be very interested when you get area code 310 numbers (could make do with 323 or 213).
I tend to use my mobile in two ways: One for clients to reach me while I am traveling in Europe. And second to make calls back to the US when I don't have broadband internet access (then I use VOIPBuster). Third on the list is for locals to reach me (but a distant third -- most will SMS).
For the first I use a CBW 800 number (well, 866). If I am in Switzerland or Germany (where I have national SIMs) I usually fwd to that number, even though it is more expensive, it tends to be more reliable. If I'm elsewhere, I fwd to my UM SIM. I have one of those do-hickies that lets me have two SIMs in the phone (though of course only 1 is active at a time) so its no big deal to switch over to the UM one to make a call with CBW.
Anyway, the point of this long ramble is having a US number (in my area code) would be of great value. Even better would be when/if I could also get a German number that would also fwd to the same SIM -- then I'd be in heaven.