Hi all,
To save you some work, I have attached an opml file of all the Underground RSS feeds - this you can use to import all the feeds in to your favourite RSS reader.
One small caveat, for the protected / secure feeds, you will need to edit the opml file and replace the string
UserName=Murray.Foxcroft&Token=da1eace2-e402-4651-9299-886defc4f18c
with your details.
You can do this by logging in to the forum and navigating to the RSS field of any locked / protected feed - e.g. http://k2underground.com/forums/128/ShowForum.aspx and checking out the link on the [RSS Available] icon on the bottom right.
I hope it works 
Cheers!