Pros
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Simple to setup
Follows reasonable Joomla coding and security guidelines.
You can choose to display one or multiple quotes.
You can choose random quotes for each page load or each day.
Deals correctly with blank lines in the text file.
Cons
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Has an undocumented, hardcoded style tag.
Only works with text files. Would be good to add a db option.
Unable to parse authors, sources, etc.
If the quotes file is not found, the script will DIE(!) and send an error message to the browser! Very bad move for a non-critical module. Better to silently abort.
Has some nice params within the script that would be good to make available in the module admin view, such as the name of the quote file to use. That would make it easy to have multiple modules in different sections showing different quotes.
Overall. Good stuff. Just needs more work. I've hacked up my copy to fix some of the above. Will share when ready.