LATER: ahh, it seems the .pm name and the package name have to be the same! Does that mean I have to put multiple packages in seperate modules??!?

No, and no. But: use does a lookup per file name. Inside a file, the package statement declares a name space. It is highly confusing if the file name and the name space name are not related, or chosen nilly-willy.

Remember that use Foo is (roughly) equivalent to

if (eval "require $package") {
    $package->import(@args);
}
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If your file is called mine.pm and you use that (use mine;), but inside that file there's a name space mypack established, the use attempts to call mine->import and not mypack->import. There is no facility in Exporter to check which name spaces have been set up by an imported file which wishes to export symbols.

As for your second question - you may set up multiple name spaces in one file, but only the name space which matches the file name will be handled correctly with Exporter.