Find any information about any package (Ubuntu 7.04)

To find out any information about any package installed on your Ubuntu machine, use the pkg-config command.
I had to find out the version installed on my machine so I did this:

pkg-config <NAME> --modversion

Here's what --help on pkg-config throws up:

$ pkg-config --help
Usage: pkg-config [OPTION...]
  --version                                      output version of pkg-config
  --modversion                                   output version for package
  --atleast-pkgconfig-version=VERSION            require given version of
                                                 pkg-config
  --libs                                         output all linker flags
  --static                                       output linker flags for
                                                 static linking
  --short-errors                                 print short errors
  --libs-only-l                                  output -l flags
  --libs-only-other                              output other libs (e.g.
                                                 -pthread)
  --libs-only-L                                  output -L flags
  --cflags                                       output all pre-processor and
                                                 compiler flags
  --cflags-only-I                                output -I flags
  --cflags-only-other                            output cflags not covered by
                                                 the cflags-only-I option
  --variable=VARIABLENAME                        get the value of a variable
  --define-variable=VARIABLENAME=VARIABLEVALUE   set the value of a variable
  --exists                                       return 0 if the module(s)
                                                 exist
  --uninstalled                                  return 0 if the uninstalled
                                                 version of one or more
                                                 module(s) or their
                                                 dependencies will be used
  --atleast-version=VERSION                      return 0 if the module is at
                                                 least version VERSION
  --exact-version=VERSION                        return 0 if the module is at
                                                 exactly version VERSION
  --max-version=VERSION                          return 0 if the module is at
                                                 no newer than version VERSION
  --list-all                                     list all known packages
  --debug                                        show verbose debug information
  --print-errors                                 show verbose information
                                                 about missing or conflicting
                                                 packages
  --silence-errors                               show verbose information
                                                 about missing or conflicting
                                                 packages
  --errors-to-stdout                             print errors from
                                                 --print-errors to stdout not
                                                 stderr

Help options
  -?, --help                                     Show this help message
  --usage                                        Display brief usage message