The Internet provides a wide range of sites that can help people researching the history of Ceredigion/Cardiganshire.
A number of the Forum members have websites of their own - details on the Members page
A few others that may be of particular assistance are:
Ceredigion County Archives
The site allows you to search through over 3000 pages of detailed catalogue contents.
National Library of Wales
Information, including online catalogues, for Ceredigion and the rest of Wales.
A family history site with a wealth of information about useful sources, down to parish level.
Website that provides high-level descriptions of thousands of archival collections at institutions throughout Wales.