Hi-Fi
I conducted an experiment on the effect of different CD transports and cabling on digital recording. I've also discovered some issues regarding digital pass-through on a Sony Minidisc deck.
Portable
I maintain some information pages on the Xclef MT-500 mp3 player.
Soundcards
I maintain a Q&A page on CMI based soundcards.
Recording
I've started auditting my CD collection for the quality of the recordings.