Why would you want to connect your PS3's component output to your TV's HDMI input? Are you using all the component inputs on your TV?
Component transmits an analog signal. HDMI transmits a digital signal. So what you would need is not just an adapter, it's an analog-to-digital converter. I've only seen one standalone analog-to-digital converter, and it wasn't cheap (around $300 if I remember correctly).
The ATI component-to-DVI-I adapter is your best bet if the DVI port on your TV is also DVI-I (which is probably the case). But the signal received by your TV will still be analog.