I have a Nexus One, I would like to know if there is any way for me to project my screen content to my large screen TV?
Nexus One does not come with a hdmi port.
By "project", do you mean "play video"? Because that might be a bit of a challenge, depending on your network and (phone) CPU.
To just get screens/presentations, you could connect a laptop to your TV and a VNC server on your phone.
If you do want to play media files, and you have a DLNA client (Xbox 360, PS3, one of the million media boxes like Roku) connected, you can install a DLNA server on your Android (search Market - there are plenty) and stream media.
Plenty of the latest TVs even have a DLNA client built in.