For strictly PC usage, HDMI is not beneficial at all, as DVI is good enough. I seriously doubt that you will see the "proper" 1080p content any time soon and I have a really hard time to believe that you will see many ps3/xbox 360 games that actually *render* in 1080p. I guess that they will probably render natively in 720p and upscale to (unlikely) 1080p or even worst case 1080i. edit: 1080p via component is simply no go and in that case one HDMI port is not enough and If you plan to combine multiple HD video sources, you need either more HDMI ports or input/ouput video receivers. If someone is keen to have perfect display who will excel as PC monitor, HDTV, gaming console, HD movies display ... I would just say good luck!
Also, I have my theory that 1080p video streams are really not that superior (compared to 720p 60fps) when we consider the eye's resolution limit, watching distance and screen size as input variables

and few other factors. More importantly, it would be hard to justify the overblown price premium for 1080p devices, especially because existence of 1080p processor doesn't necessarily translate into 1080p capable HDTV

It's probably off topic, so I will not bother you with this ... but if someone is interested I can write few more words