If you don't need HD, well then you can pretty much use every solution out there.
Too bad wifi n standard isn't stable enough to stream blurays. Funny thing is that blurays usually use something like max 60Mbps bitrates and n standards max output is 300Mbps AND it's not sufficient enough to even stream smoothly 20Mbps content. Of course your results may vary but these were my findings when I tried my house wireless. I just prefer some hidden cat5 cables here and there over wireless that doesn't work properly and usually picture gets choppy in the middle of action scenes.
But if you need HD, NMT players like Popcorn Hour and iStar are only way to go. Only thing you need to know with current gen of NMT players is that they don't play well x264s that are encoded with L5.0 or "higher" preset. L4.1 is the highest the chip can hardware decode. However this isn't really a problem unless you are in the habit of taking some shitty amateur x264s from Limewire or something. 99% of movie releases in the net made by warez groups are done with L4.1. Since there actually even isn't any good reason to use L5.1 quality-wise.
So what I have done is that if I download a release that doesn't work. Like for example some fucking idiot encoded Hellboy II 1080p x264 with L5.1, you just take 720p version. Easy as that. I'm not so much into MPEG4 so I can't say for sure but in my experience for some reason all 720p encodes are done with L4.1 in the warez scene. At least I haven't still encountered 720p version that didn't play properly in iStar.
And what comes to real HD, you can't play Blurays with menus and all that shit, YET, but you can already play m2ts files which are blurays movie files and get same sound quality (yes, it does passthru True-HD and so on) and get the same picture quality.
Now tell me how much it costs to make HTPC that plays all blurays smoothly. And word of advice, Radeon maybe able to decode your blurays with GPU but you still have to have CPU power to decode the sound and I actually had to buy better CPU (AMD 3200 wasn't enough) to get movies with DTS-HD to play smooth. Video was fine but audio was causing choppiness. So don't believe the promises they are making. These new display cards may enable your set to play bluray VIDEO smoothly but audio is a whole different thing. Funny, can you find any word of warning about that in the websites?
