ASUS' MyNet app is a preinstalled DLNA controller that lets you push content from the Eee Pad to DLNA compliant devices on the same network.
With MyNet preinstalled, you can play audio/video files from or to your DLNA compliant Windows PC. A short workflow for your reference:

1. Ensure that your Eee Pad and source PC have connected to the same wireless access point.

2. Click and enable Allow remote control of my Player and Automatically devices to play my media in the Media Player on the PC.

3. Start up MyNet on your Transformer Tablet, and select your PC on the left (source) and your Eee Pad Transformer on the top right corner(target).

2. Switch the file type on the top and select the movies you’d like to play.
Not all the videos can be streamed from PC to HDTV via DLNA. Only specified media formats (MPEG-1, MPEG-4 and WMV 9) are good for DLNA video streaming. Errors occur in case of unsupported video format. Native formats for DLNA media streaming:

Video MPEG4 AVC (AAC LC Assoc Audio) VC1, H.263, MPEG4 part 2, MPEG2, MPEG4 AVC (BSAC or other for Assoc. Audio)

If you're having problem with streaming MKV, AVI, WMV, MPEG videos to Transformer Tablet, you can transcode the format to one of the applicable required formats. A recommended transcoder here is Pavtube Video Converter, which uses CUDA acceleration tech and converts videos fast enough. You can also use Blu-ray Ripper app to convert Blu-rays and DVDs to PC hard drive and your PC a DMS for streaming to other Android tablet like Google Nexus 7 and smartphones.