The Acer Aspire easyStore Home Server H340 manual popped up on the internet. It use it's own DLNA (1.5) server named Digital Media Server. It has a low profile pci-e 1x slot (e.g.: for a tuner, a video card, additional eSATA ports, firewire card, etc). The manual is comprehensive and there’s a lot more to read and discover in the Acer Aspire easyStore Home Server’s manual – whilst it only has some of the media-centric features of the HP MediaSmart Server, it looks like a great package and most importantly, is being made available globally.
Download: Acer Aspire easyStore Home Server Manual