Digital Media Converter Pro can convert your DVR-MS files.
For the Playstation 3 I suggest converting to Custom MPEG4 and select the h.264 compressor to get high quality files with small file sizes. Place your files on your USB flash drive in a folder named 'videos' and they will automatically show up on your PS3 when you insert the USB stick.
For your DVD player you will need to create a MPEG-2 file. Click Select Format on the toolbar and choose MPEG 2 DVD. After conversion, you can burn your video to disc with DVD Author Plus.