nah, lets just rag on the stupid twentyten and twentyeleven devs for lacking common sense… 
actually it would be good to have a general theme for those really narrow widths…
any narrow theme really should use a stacked type arrangement, which you are… but you need to adjust the column widths on spTopicView.php… so the above post info is really in the 4 columns… maybe something like 7%, 15%, 40% and 30%…
the quicklinks and quickforum look a bit odd spaced above the search like that… might be better to stack them one on top of the other, in parallel to the search input and link?? thats actually a tough area for the narrow stuff…
but definitely a good start… thanks for taking it on!