The Annexe is a useful emergency refuge when Mudcat is out of action. As said above, it is worth visiting even when Mudcat is running smoothly. I believe the Annexe officially belongs to Pip although Jon maintains the technical stuff. Jon also runs his own site www.folkinfo.org, which is also worth a visit.
Jon has a number of projects for his site. One is collections of tunes in ABC format. Another is a song database with detailed information about printed sources or how/where collected. A useful utility is an online conversion of ABC format tunes which allows you to transpose to a new key, and also to produce sheet music and MIDI files.
Quack!
GtD.