Here they are (there are more than 10, but that's why Perl is great: tons of super-useful modules):

Modules that make Perl what it is:

• CGI (+ CGI::Carp), I am an old school guy (but I use it with mod_perl when it makes sense though),
• DBI (+ DBD::mysql, DBD::Pg, DBD::SQLite), SQLite for quick hacks and when there is only one user, Pg most of the time,

Very useful:

• Text::Template, simple but powerful enough for me,
• YAML, successor to Data::Denter, nicer output IMHO than Data::Dumper, safer to use too, modified to allow for variables (a-la-XML::Simple in its latest version)
• Inline::File, an yes, I do pack templates with the code now (see Re: Favourite modules),
• Getopt::Std, I should really switch to Getopt::Long though
• Text::Iconv or Encode depending on the version of Perl available
• Scalar::Util, for weaken, that allows me to use complex data structures while still taking advantage of Perl's garbage collection,
• File::Find, I haven't switched to File::Find::Rule yet

Convenient modules I use a lot these days:

• Memoize, especially to memoize the output of the following one,
• Digest::MD5, to sort through heaps of archived data and figure out what was stored twice under different names

XML modules:

• XML::Twig, surprise surprise ;--)
• XML::Simple, battles with YAML for my configuration storage needs,
• XML::PYX, for one-liners,
• XML::LibXML, when I manage to get it installed, which is not that often

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