Apparently I am embarking on the CCIP track next. I suppose that's a good stepping stone towards CCIE anyway.

I just subscribed to the INE CCIP videos. For others who've taken that path, do you believe they cover the concepts well enough to be used as the only source for theory, the same way a Cisco Press Foundation Learning Guide would be?
(Obviously, practice is also essential to passing Cisco professional-level exams.)