+1 to the cookbook. Beyond reading the canonical books and referring to the hyperspec, it has been truly the most practical resource for learning more boots-on-the-ground things you will need to do in development. I wish some of the chapters weren't so focused on specific 3rd party libs, because some of it feels out of date now, but it is still by far more helpful than not.
I am mainly thinking of testing, and if FiveAM is still the way to go, because there is a note at the beginning about Rove, which seems to be pretty well maintained these days. But looking at FiveAM again I see some recent commits. Also, in the concurrency chapter there is the section on lparallel, which seems like a very old unmaintained library.
This all said, I think one thing that makes cl nice is that it doesn't feel out of the question to use a very old library for something you need. So none of this is actually a problem.
FiveAM is still a very good solution, difficult to replace. We didn't replace it with another test framework, and we looked at a few of them. Rove doesn't live on its promise to run `rove <system>` on the command line for example.
