I don't know about the mental part, but physically I'm back from Alaska. While waiting for some sys-admin things to get done last night I wrote a few Unix/Linux tips in the "etc" section of the blog. This includes tips on extracting lines from the middle of a file, determining the free memory on a Linux system, using the nohup command, and displaying nonprintable characters from a file. Busy night.
I went a little crazy and created an online version of some Linux man pages. This is a great first step, but what I really need on it is a search engine. IMHO, this is a good improvement over just having a bunch of man pages laying around that you can't search very well.