I've added ECB to my list of things to play with after seeing this: http://t.co/oG5nIorELe . It's also recently moved off CVS!
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The most common selling point I hear for Nix is having a list of all the packages you need.
On a traditional Linux distro, I just install things and forget about them. A curated, commented list would certainly be handy when I have a new system.
I've been compilation buffers in Emacs recently and I really appreciate the error and warning counts shown in the modeline.
I've added the equivalent feature to deadgrep: it shows result counts! Really useful when you're doing big refactorings.
https://github.com/Wilfred/deadgrep
I've started keeping a list of particularly interesting bugs and patches that I've worked on: https://github.com/Wilfred/interesting-code
The time that I once removed *a single closing paren* in Emacs is still my favourite.