The largest problem of Micro ATX boards is that manufacturers want to use chipsets that support integrated video, which nForce3/4 chipsets don't. It really sucks that this limits your options so severely, but their typical response is "we have a shitbox, er, SFF cube for you".
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>