Here are some previous posts that I’ve done over the last year or so that you may find useful rather than you having to search around:
You may also find this page useful as it has lots of useful links to all sorts of travel information – http://www.south-wales.org/useful-south-wales-links/
Update: Wednesday 6th January – it seems the webcams are struggling with the load of people trying to have a look. You may find that they don’t work for you.
Update: Thursday 16th December 2010 – you may find this new page useful – http://www.south-wales.org/2010/useful-information-for-south-wales-snow/