If any of you have been complaining that you want to use SM5 but none of your themes are on it, you've come to the right place. I'm going to help you convert all those suckers over. Now here's the catch, you're going to have to do all the work yourselves, but I will give you a lot of instruction along the way and even some conversion software to help out.
I've converted 2 themes over from 3.9 to SM5 last year so I know how simple the process can be. Back then I didn't have any way to make it any easier through the use of software, but now you hold that power, and we're going to work together to make this a reality.
You don't need theming experience at all :). I can help you via IRC, AIM, whatever you choose. The boards aren't really the place for spamming posts about theme conversions, haha.
I just helped someone with a tutorial earlier today for explaining how the 3.9 stuff works in SM5's Lua. I think it's a bit complicated for a starter though, but if you have any comments or questions, I'll be more than welcome to answer then for you or make this easier so you understand it. Right now, I was going for a bit of an advanced approach, but it can be much much easier than this even if you find this too difficult for your tastes.
I've attached it so you can take a look. I'd recommend using a text editor with Lua syntax highlighting if you're going to be doing this. My favorite is http://www.notepad-plus-plus.org/.
Original 3.9 INI file
Thanks to Missingno_force for providing the ini file.
SM5 Lua Tutorial conversion
This is what I made with instructions. It should be good for a start, but like I said, it's a bit complicated because it's assuming you know some things.
Please use a text editor with syntax highlighting, or it will be difficult to follow along or do anything. You can copy/paste the contents of the file and name it a .lua file, or you can save the file manually by going to http://byebud.com/sm5/theming_tutorial/, right-clicking the lua file, and hitting "Save As...".