DLNA & USB Limitations
I bought one of these last week; the review covers some of the good points, but is pretty superficial
USB: Needs to be formatted FAT, which means a 4Gb limitation. Plays back mp4, but AVI codec support is limited - I've successfully played only one of 20+ test divx/xvid avis
DLNA: for video, only appears to support MPG2 files - great for a ripped DVD but not for my library of wmv/avi TV recordings
Windows Remote Play: a promising feature, but works intermittently on my PCs - it's possible to stream video straight to the Bravia, and this works for pretty much all my avi's, but only on some of my (4) pcs, some of the time...
BBC iPlayer - not here yet, due in the autumn
Summary - confusing video format support, we have to hope for an update