A better stack trace then my previous attempt: Trace Warnings
This one uses Carp as per merlyn's suggestion.
use Carp;

# Fatal stack trace made non-fatal.
eval q{confess('Stack Trace')}; 
print $@; # $@ is set by eval().

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You can put the last two lines anywhere to get a stack trace to that point. So if you had a weird warning (the reason for my previous attempt) you could set $SIG{__WARN__} to that two line sub-routine.

That may seem trivial, but it took me awhile to have that light-bulb come on... so I thought I would post it.

In reply to Stack Trace by Adam

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