filesystems - When is using MySQL BLOB recommended?

Question

I'm coding an application that will be uploading and deleting many files, i usually just move the files to a folder in the server naming them with the row unique id. But as i understand MySQL also lets me store binary data (files) when would this be a better choice?.

Please use solid arguments, like When does using BLOB will mean performance improvement?.

P.S: I'm using MyISAM if that matters.

Thanks.

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UPDATE:

Related questions:
- Storing Images in DB - Yea or Nay?
- To Do or Not to Do: Store Images in a Database (thanks to Sebastian)

UPDATE 2

Storing the files in the database is not a need i'm trying to know when is this a better idea than storing them in folders.

Answer 1

Read:

• MySQL Binary Storage using BLOB VS OS File System: large files, large quantities, large problems
• To Do or Not to Do: Store Images in a Database

which concludes

If you on occasion need to retrieve an image and it has to be available on several different web servers. But I think that's pretty much it.

• If it doesn't have to be available on several servers, it's always better to put them in the file system.
• If it has to be available on several servers and there's actually some kind of load in the system, you'll need some kind of distributed storage.