The latest patch is Dragon Age: Origins 1.05. Applying this patch is highly recommended (GOG.com, Steam and Origin users do not need to install the patch).
Numerous issues are fixed in Qwinn's Ultimate Dragon Age: Origins Fixpack.
The Ultimate Edition of Dragon Age: Origins sometimes crashes upon exiting.
If you are having issues logging into Dragon Age: Origins with your EA Account it is most likely because you have special characters (like "#") in your password which the game does not support.