for both forum titles and, if i remember correctly, message titles, if there are no spaces the title can break the layout.

one solution would do character count on the title and break it at word boundaries, keep only up to a maximum length, wrap that in a span with the title attribute set to the full title (so you can see it on mouseover / tooltip?), and use some sort of indicator so users know the title is longer than viewable length.

another solution is setting a maximum length on the initial input i guess, but i like my first way better ^_