The Oxford books are the best, if you really are interested in knowing things a bit deeper then just passing your exams.
I have tried a few others too, and would say there are some pretty awful notes lurking around from other companies, but dont wish to name and shame them. But a hint is that they are more expensive then the Oxford books, and are completely waste of space!
Distance learning, probably the best the Bristol CD together with some of Oxford CBT and books. Jeppesen not that bad either, an older version of Oxford. Only thing, there is more than you need to know with Oxford, for the ones just looking to pass the theory exams.