If you can't go to the modern frameworks, I quite like Dancer myself, you can get an ebook from O'Reilly (or used).
1: http://www.modernperlbooks.com/mt/2011/03/why-psgiplack-matt...
2: http://search.cpan.org/~miyagawa/PSGI-1.102/PSGI.pod
D'oh! Now I see below that your duplicate of this question got the love it deserved already...
If you can't go to the modern frameworks, I quite like Dancer myself, you can get an ebook from O'Reilly (or used).