Whilst browsing the Internet today I came across this useful site, an online guide to Cardiff pubs. Having used the excellent pocket-sized maps made by the same person for years, I can recommend the useful information contained on both the the website and the maps.
The website contains photographs of the individual pubs both interior and exterior and a pub sign if they have one. A brief description of the pub is given, together with the opening times as well as a link to Multimap to help you find the pub. Not yet checked out the website via mobile Internet but will do so later.
An useful site if you regularly use pubs in Cardiff.