globe:
With this one if i played something through my TV such as from a USB stick, or the sky box can I still record on the HDD (or DVD ?)
Recording while watching from USB stick - Not all files.
According to the manual you can't playback DivX or MKV files while recording. Looks like mp4 and mpeg2 are OK.
From the Skybox yes, as it will be via the AV input, not USB. Normally though you would connect Sky to your TV as well as the Recorder and watch Sky via the TV connection.
You could always plug the USB stick into the TV and watch as long as the TV will play the file format.
You can also watch files on your PC as the unit has built in WiFi networking and DNLA.