If you have a base its better than starting from 0. Now for my sales pitch:
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End of sales pitch. Thank you for your time and for tolerating my excessive use of exclamation points.
How many times has it been "the year of Linux" over the years?
I don't know if it's the year of Linux or not, but I think with economic times being what they are it is certainly a good time to brush up on some skills and strengthen your resume.
You can do that at WiBit.net
I definitely agree with you on the memory management point. All I am suggesting over-all is a straight shot approach. Start with C, then C++, then probably Objective C, then Java, on and on. Each language broaches concepts and don't repeat the taught concepts of the previous languages. I can't tell you how many times I've watched a tutorial or read a book and it's gone over what OOP is when this is something I should (usually) know already. I've not used Objective Pascal so I can't really comment on it, but I'm sure it came after C++ and therefore probably borrows concepts from it?