Thanks for the great post, @Reeza! I hadn't know about Computer Science Illuminated, so I'll have to check that out. The Art of Computer Programming is also a fantastic reference by one of the greats of computer science.
I'd also like to through in a shout-out to sasCommunity.org. Daily tips are worth at least a quick read, and there are many advantages of a wiki, including links between pages, categories, and the fact that all the content is contributed by the community.
While it's in the process of being decommissioned, it seems likely that the site will still be available for perusal for some time (and is preserved in the Internet Archive's Wayback Machine). Plus, sasCommunity.org/planet is an excellent blog aggregator that has helped me find some great things to read.
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