One of the annoying aspects when inlining images is the fact that it seems to be possible to blow the margins by any amount with no limit. Once a thread contain an image a few thousand pixels wide, all posts in the thread will wrap the text at a width of several screens wide, putting entire paragraphs on single lines and forcing the reader to constantly scroll left and right while reading.
Lithium really should find a solution for this. Other forums automatically reaplace inlined images above a certain size with a smaller thumbnail version, which, when clicked would open the full-sized image in a new window.