A fact that more than 130 people viewed this poll, and none has voted.
The challenge of writing good polling questions is very high. I submit to you that there are a wide array of ways one could interpret your poll question. Do we want to use a Windows version? Do we want a Windows version available so that the space of would-be SheevaPlug developers could broaden? Very ambiguous at best.
Indeed, as I'm sure you well know, there is a whole science of phrasing polling questions in a way to garner a desired result :-)...
What I find much more helpful is to understand the various things that could be done and prioritize them.
If, instead, you were to craft your "poll" to list the various U-Boot enhancements being considered, estimate their development time, and allow folks like us forum-its to prioritize the list to our own preferences, that would be both clearer what was being asked and, I dare say, more helpful to you.