I have mainly been overdoing it again. Having got IP5 (almost) to the point where I can create a whole new website just by copying the template directories and setting up a new database, I've been working on some of the backend scripts - the CMS, and RSS feeds and viewers.
Eg:
http://dev.ukcycling.net/ (in progress)
All great fun, and an increasingly powerful system (pretty much everything listed at
http://www.infinitepenguins.net now works), but I should probably cut down on the time I spend on it at home, and do things like sleep!