[Newbies] Gofer, Metacello

[Bruce Prior]

Is there a brief tutorial somewhere that describes Gofer and Metacello? 
I went to SqueakSource and I see that all the files in Metacello are 
"Configurationof<Filename>." I am familiar with Monticello and 
repositories but Gofer and Metacello seem to have crept up on me 
unawares. There is nothing in Squeak Wiki about them.
Thanks in advance for your help.
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