A source for document class layouts?

[Dave Hewitt]

Many thanks to Paul Rubin for his recent help on document classes. But, as 
he probably suspected, my dilemna continues (me and the wolverine are both 
a bit worse for wear, but we'll live) and now I think it rises to a new 
level...

There's many wonderful document classes out there, and new users are 
probably interested in trying them out in LyX, but the layout file is (as 
described) difficult to deal with. I spent an hour or so messing with NRC's 
classes and a couple others (using Paul's suggestions and the Customization 
Ch. 5), all to no avail. LyX fails to convert files with just a single line 
of text into any of the three I tried (from article).

So, my question is: is there a repository somewhere of layout files that 
people have created to work with the various document classes?

Dave Hewitt