Apparently it is the fourth annual run (I missed the last one as I only found out afterwards) with 550 people taking part, but it sounds like it's getting bigger every year. The weather may have been the best so far this year - with my forehead receiving a touch of sunburn.
There were lots of excellent costumes, including several Dangermouses (Dangermice?, Supermen, Banana Men, Hulks, Buzz lightyears, and some standouts including Iron man, She-Hulk and Silver Surfer. The Penelope Pitstop girls who were helping out the organisers and taking photos looked very cool!
My photos of the day were included in a write up of the day at the Forbidden Planet blog, making me a regular Peter Parker - professional superhero photographer.
My photos:
Featured on a wonderwoman blog!
More of my photos on Facebook gallery.
A youtube video someone did of the day:
Other links:
Argus online write-up and video.
Some more photos here that turned up in a google search.