What is the usage scenario's for using a dedicated Form library instead of using a custom list as where you modify the data entry form with InfoPath?
Is it if you want the added functionality you get when using the installed client instead of the web version (in SP Ent. Ed)?
In my head I would probably create a list for most cases as they are easier to work with, and I don't have to deal with adding the InfoPath logic of generating unique filenames for the form submissions.
I hope someone can enlighten me a nit here :)