If you are stil in the market, there is not HARP2, a program that really can finance you if you are upside down.
Call me at 415-683-6950 or email email@example.com with your details and I will see if I can help you.
Hang in there. As part of Obama's housing bailout plan, you may be eligible to refinance your home even though you owe more than it is worth. I have posted a link to the Wall St. Journal's FAQ on this topic.
You may also be eligible for a note modification even though you are not behind on payments. Again, reference the above link for details.
Finally, you should look into why your taxes went up - almost all areas of California declined over the past year. You may want to contact your county tax assessor to see if you are eligible for a reduction in property taxes - assuming your property declined in value since the time you purchased it.