> 1.9.1, on the other hand, get gems installed in ~/.gem/ruby/1.9.1

Oh gotcha thanks for pointing it out. I thought for some reason that 
they shared a bin directory.

> 1.8.6 and 1.8.7 are supposed to be compatible.

For me they have been all except ruby inline, whose generated .so files 
aren't compatible [and live in ~/.ruby_inline for all versions of ruby]. 
Also I'm not sure if rev binaries are compatible with both 
simultaneously.

But anyway I'm only using one version of 1.8 so we're ok there :)

Thanks!
-=r
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