You can put your own logo at the top, but there is one banner, sort of advertisement and you cannot remove that banner. That's why it's free because that advertisement.

You can change almost everything on that board, and you can upload max. 16mb on their servers but if you host an image or avatar then there's isn't a problem.

http://invisionfree.com/forums/support/ this is their support section, please read all the sticky's.

Here is the skinning section http://invisionfree.com/forums/ifskinzone

I cannot explain how may things you can do with this board, there are to many things you can do with it.

Just register at the support and skinning section and read the sticky's.
Many code's and hacks for the board and it costs nothing!!

Your domain name will look like this http://s8.invisionfree.com/yourname

When i registerd a board i thought, how the hell i'm gonna use this but when i read the support and skinning section it all came clear to me.

http://invisionfree.com/index.php?p=resources

Cheers