[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.
Thanks in advance for your help.
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