I’ve found a number of login system examples using the wwwForm class and php. But I have alot stronger interest in getting myself familiar with ruby on rails and am curious, has anyone hooked unity into a mysql database (or other) using ruby on rails as the intermedium? Would you be willing to share any knowledge or code bits on what you do?

I would look in RUBY forums for such answers.

The WWW and WWWForm object from Unity provides simple GET and POST requests against any webserver. I use ASP.NET (C#) and these classes works okay with that too.

So my suggestion would be to look for a “simple login with ruby” and then convert the client(browser-html) part into Unity script.
Search like this: simple login with ruby - Google Search

That ought to do it.

and then read up on WWW and WWWForm objects in Unity3D
http://unity3d.com/support/documentation/ScriptReference/WWWForm.html