I'm trying to prevent iron and gold farms on my server, so I have IRON_INGOT replaced with PUMPKIN, and when players die, their iron ingots are dropping as pumpkins. I thought this was supposed to only work for mobs?

That is not something I thought of in the original context -- but it should not be hard to fix. Brb.

Thank you so much for fixing it! Your plugin is perfect for what I'm trying to do. :)

Almost forgot...where do I get version 1.1.0?

Sorry for the inconvenience -- I guess I hadn't thought that through very well. Version 1.1.0 well now only edit the drops of monsters / animals, not all entities as before.

It should be I just uploaded it to BukkitDev -- so it should end up where the version was once they approve it. In the mean time you can use this link:
http://www.mediafire.com/download/izk2m6ibh766qbp/MobDropStopper.jar

Thanks!