You're correct that HDMI is a digital signal; and it does NOT have any analog signals that you can easily use for a component video connection.
The gaming-oriented HDMI => component adapters MAY work fine with your system ... but they will NOT pass any HDCP-protected content ... so you won't, for example, be able to play BluRay movies (if your laptop has a BluRay drive). Here's one that's fully HDCP-enabled:
http://www.curtpalme.com/HDFury2.shtm