Kudos. That is a really great idea for eliminating annoying typos in POD -- somehow, I always seem to catch a typo after I've released to CPAN (something to do with the really nice POD2HTML formatter they have, I guess). However... at the risk of reopening the Test::Pod/Test::Pod::Coverage flamewar, I'm also really glad that you caution in your docs about including a test like this in a distribution because of the the new dependency chain it adds:
The way I see it, unless one is only writing for internal use or for someone with exactly the same system setup that one has, there are going to be a lot of spurious failures and frustrated downloaders.
If someone wants to check spelling with a .t file, I'd recommend not including it in the MANIFEST (and adding it to MANIFEST.SKIP) so it stays internal for one's own development purposes.
For your "todo" list -- I suggest having it skip gracefully instead of failing if it can't find the external spell checker.
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In reply to Re: Improve the speling for you moduels documention