I'm trying to create a process that renames all my filenames to Camel/Capital Case. The closest I have to getting there is this:

perl -i.bak -ple 's/\b([a-z])/\u$1/g;' *.txt # or similar .extension.

Which seems to create a backup file(which I'll remove when it's verified this does what I want); but instead of renaming the filename, it renames the text inside of the file. Is there an easier way to do this? The theory is that I have several office documents in various formats, as I'm a bit anal-retentive, and would like them to look like this:

New Document.odt
Roffle.ogg
Etc.Etc

Is this possible with perl, or do I need to change to another language/combination of them?

Also, is there anyway to make this recursive, such that /foo/foo/documents has all files renamed, as does /foo/foo/documents/foo?

The only way this will work is to have an inclusivre, definitive rule that works on ALL filenames you intend to change. You have to be able to identify words - are they all delimited by spaces or underline characters, for example. With no delimiters in a filename you assume the filename is a single word.

What rule do you have?

BTW using spaces and shell metacharacters in filenames will cause you heartburn later on.
Guaranteed.

Currently they look like this:
file name.ogg
foo foo.txt
dog cat.odt

I assume that would be with spaces instead of underline? I have very, very little programming experience, but would love to learn.

What is "Camel/Capital Case" ? I am not a native English speaker.

Camel case is when you use capital letters for sub-words, e.g. someCamelCasedWord. So named because the letters are like the humps on a camel. Capital case (I assume) is the same, but with a capital letter at the beginning, e.g. SomeCapitalCasedWord. Camel case is the norm for variables in newer programming languages nowadays since longer variable names are expected (except in Lisp languages which prefer to use dashes to separate words). You still see underscore delimited words, but typically in older languages like C.