i'm replying here because i feel this post belongs more in this section than fans & control. you might want to delete your other post about this.
i don't think the problem here is new boards purposely dropping speedfan support, but different (newer, better, etc.) controller chips being used that speedfan doesn't yet support. maybe in a few months every board on the market will work. i just don't know.
of motherboards which support fan speed control includes many recent boards, though a lot of the comments indicate that fan control only works on 1 or 2 out of 3 or 4 fan headers. with future speedfan and board bios updates (you have been emailing the manufacturers about fan control, haven't you??) the range of boards will increase. these things just take time, as manufacturers are usually loathe to release specifications even though it can make them more money in the end.