I came across a link where you can send your senators/representatives in Congress a message regarding the caps that currently exist for tax credits on hybrids. Once a manufacturer sells 60,000 hybrid vehicles, the tax credit for that manufacturer begins to be phased out.

Several bills have been introduced that have language lifting the cap. Please ask your members of Congress to support consumer choice for cleaner cars by lifting the manufacturers' cap on the advanced vehicle tax credit.

If you are interested, take a moment to read the pre-printed letter. It can be modified by you. (I thought the sentence mentioning the Camry sounded out-dated, since that model has been in production already, so I modified that when I sent my letter.)
Anyway, here's the link for you to take a look at:

http://ucsaction.org/campaign/02_01_...ce=wacmicro_hc