I've had my PCH A-110 for about a month, playing around with it, reading, figuring out how I want to set it up. I have no interest in using it for internet access and I've decided against streaming, so I'm not going to network it at all. I'll be getting a 1 or 2 GB CF card and adapter and use that as my internal hd. This will be formatted EXT 3 thru the PCH, which will allow me to use the cool-looking skins that are available to improve the interface and give it some variety.
All my media will be on ext hd's, which will be used for storage, backup, and streaming. I plan to buy the USB Sans Digital 4 Bay TowerRaid discussed earlier in this thread and fill it with 1 TB hd's as I need them. I'll buy 2 at a time and either mirror them or sync them so my files are backed up. I like this unit because it automatically powers down the hd's when the PCH is turned off. When that tower gets filled, I'll get another one for the second USB port.
I may use YAMJ if it's possible w/this setup, but I doubt it. Instead I have the Movie Collector program on my computer, this gives me all the info I need and is customizable. For instance I have one column for Last View Date and another for which PCH hd the movie is on. This way I can just look at a list of movies I haven't seen in X amount of time (or haven't seen at all) and then go to that hd on my PCH. To make maneuvering thru so many movies as simple as possible I will have each hd divided into 11 folders (0-9, A-B, C-D, E-F, G-H-I, etc) so all folders will fit on one page. So there should only be 1 to 3 pages of movies at the most per folder. I also have two buttons on my remote setup as macros that step up and down 5 files on the page at a time. (I'm big on macros!) For my tv files, I won't have nearly as many of them, they'll be divided into folders such as Comedy, Drama, Mini-Series, BBC, Documentary, etc.
With this setup I don't have to worry about heat issues or hi-def streaming issues. I'll have virtually unlimited storage, secure backup, and quick and easy access to my files.