Not a bad effort, but I think the mobile (lite) verison could do with some work. All the following has been tried on an iPhone and hence that is the perspective of the comments:
1) The login screen, I had to zoom in to be able to click in them and type.
2) After logging in, the thread list was again too "zoomed out". I had to zoom in to be able to properly click on any thread, but then it was side-scroll city.
3) I have seen on many mobile sites the address bar being scrolled up and out of the way once the page is loaded. Looks a lot more professional.
4) Going into a thread, once again the text is too small. You need to zoom in, but then you have to scroll from side to side, as the text wrap is too wide on the screen.
5) Buttons or links like the Reply button should be made bigger to accommodate fingers.
6) And again, replying brings up boxes that are both too small (on initial zoom) and too large (once entered) to allow comfortable use.
But, saying all that, it is certainly a great start and a good idea. I'm sure there are many here that are CSS buffs that could make it even better.
Thanks,
Mark