Slogger by @ttscoff
Brett Terpstra and some other developers have been doing some really cool stuff with Slogger recently. It’s a social logger for Day One and, this is is new, it’s also now possible to write everything to plain text files.
Slogger logs everything because it supports RSS feeds. So if there is no plugin for the thing you want to log, you can still log it using RSS. If RSS is no option, try to tweet it and log the Twitter feed of that user.