[Catalyst] My::App vs MyApp ?

[Corey]

Hello - I'm new to catalyst; just got done browsing all the perldoc.

I'm wondering when/why one would use, say 'catalyst.pl My::App' rather than 
'catalyst.pl MyApp'?

I note the difference this creates in the directory structure - but I'm not 
understanding why one would desire the "extra" directory layer -  i.e. 
'.../lib/My/App/[C,M,V]' vs '.../lib/MyApp/[C,M,V]'


Thanks!