in reply to Help update the Phalanx 100

Here is a first list of the modules that are the most frequently listed as prereqs in META.yml (which is about a third of the distributions present on the CPAN). Dirty scripts which produced this are available on demand.
87 DBI 63 URI 63 Kwiki 58 Params::Validate 56 Template 56 DateTime 55 LWP::UserAgent 52 POE 46 YAML 41 WWW::Mechanize 40 Class::Accessor 34 LWP 33 XML::LibXML 32 Class::DBI 32 URI::Escape 28 Error 28 HTML::Parser 27 Compress::Zlib 25 mod_perl 25 Parse::RecDescent 24 LWP::Simple 24 Test::Exception 24 Date::Parse 24 XML::Parser 24 Time::Piece 23 Tk 22 Email::Simple 22 HTTP::Request 22 HTML::Entities 22 HTML::Mason 21 File::Find::Rule 21 Test::Pod 20 IO::Scalar 20 Apache::Request 20 Digest::SHA1 20 Clone 19 CGI::Application 18 IO::Zlib 18 File::Slurp 17 XML::Simple 17 UNIVERSAL::require 17 Exception::Class 17 GD 16 DBD::SQLite 16 XML::RSS 15 Class::MethodMaker 15 Cache::Cache 15 Pod::Simple 15 Spiffy 15 Class::Data::Inheritable 15 XML::SAX 14 Image::Size 14 Maypole 14 Carp::Assert 14 HTML::TokeParser 14 Date::Calc 14 Test::Builder::Tester 13 Class::Accessor::Fast 13 Log::Log4perl 13 Object::props 12 HTML::Template 12 CGI::Session 12 DBD::mysql 12 Inline 12 Log::Dispatch 12 XML::XPath 12 HTTP::Cookies 11 SOAP::Lite 11 HTML::TreeBuilder 11 Email::Address 11 XML::LibXSLT 11 Net::LDAP 11 Tie::IxHash 11 Regexp::Common 11 Win32::OLE 11 Term::ReadKey 11 Archive::Tar 10 Net::DNS 10 IO::String 10 HTTP::Date 10 Module::Build 10 CGI::Builder 10 Apache 10 Date::Manip 10 load 10 CGI::Wiki 10 Archive::Zip 10 Wx 10 Apache::Cookie 10 Image::Magick 9 DateTime::Set 9 Gtk2 9 Class::Accessor::Chained 9 Apache::Test 9 IO::All 9 Algorithm::Diff 9 Mail::Sendmail 9 Test::Pod::Coverage 9 Email::MIME 9 Date::Format 9 Mail::Address 9 Math::Symbolic 8 Class::props 8 Email::Valid 8 HTML::TokeParser::Simple 8 Exporter::Lite 8 Apache::Session 8 MP3::Info 8 Locale::Maketext::Simple 7 Object::groups 7 File::Type 7 GraphViz 7 BerkeleyDB 7 Mail::Internet 7 Config::General 7 URI::URL 7 HTTP::Response 7 HTTP::Status 7 Module::Pluggable 7 Text::Template